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Q:

The positions of the first and sixth digits in the number 5109238674 are interchanged. Similarly the positions of the second and the seventh digits are interchanged and so on . which of the following will be the third digit from the right end after the after the rearrangement?

A) 9	B) 0
C) 6	D) 3

Answer & Explanation Answer: B) 0

Explanation:

There are 10 digits. Now, third digit from the right means (10-3+1 = ) 8th digit from the left. But, from the question , third and eighth digits are interchanged. Hence, the required digit is the third digit of the given number, ie 0.

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Q:

How many such pairs of digits are there in the number 421579368 each of which has as many digits between them in the number as when they are arranged in ascending order?

A) None	B) One
C) Two	D) Three

Answer & Explanation Answer: D) Three

Explanation:

Given Number: 4 2 1 5 7 9 3 6 8

Ascending order: 1 2 3 4 5 6 7 8 9

Hence the required pairs are 12, 49, 16

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Q:

In the number 76534218 each digit is replaced next digit, ie '1' is replaced by '2' , '2' is replaced by '3' and so on and then the digits are arranged in ascending order from left to right, which digit will be fifth from the left end?

A) 6	B) 5
C) 7	D) 4

Answer & Explanation Answer: A) 6

Explanation:

Given Number : 7 6 5 3 4 2 1 8

New Number : 8 7 6 4 5 3 2 9

Ascending Order : 2 3 4 5 6 7 8 9

Fifth digit in the above ascending order arrangement is '6' . Hence option(1) is the correct answer.

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Q:

How many even numbers are there in the following sequence of numbers which are immediately followed by an odd number as well as immediately preceded by an even number?

8 5 8 6 7 6 8 9 3 2 7 5 3 4 2 2 3 5 5 2 2 8 1 1 9 3 1 7 5 1

A) 2	B) 3
C) 4	D) 5

Answer & Explanation Answer: C) 4

Explanation:

We have to find out even number - even number - odd number sequence.

8 5 8 6 7 6 8 9 3 2 7 5 3 4 2 2 3 5 5 2 2 8 1 1 9 3 1 7 5 1

There are four such such even numbers: 6,8,2 and 8.

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Q:

What should come next in the following number series?

9 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 7 6 5 4 3 2 1

A) 9	B) 8
C) 7	D) 6

Answer & Explanation Answer: D) 6

Explanation:

Here the series is:

987654321, 87654321, 7654321, 65...

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Q:

Three persons A, B and C are standing in a queue. There are five persons between A and B and eight persons between B and C. If there be three persons ahead of C and 21 persons behind A, what could be the minimum number of persons in the queue?

A) 41	B) 40
C) 28	D) 27

Answer & Explanation Answer: C) 28

Explanation:

Three persons A, B, C can be arranged in a queue in six different ways, ie ABC, CBA, BAC, CAB, BCA, ACB. But since there are only 3 persons ahead of C, so C should be in front of the queue. Thus, there are only two possible arrangements, ie CBA and CAB.

We may consider the two cases as under:

Case I: $\overset{3}{\leftarrow} C \overset{8}{\leftrightarrow} B \overset{5}{\leftrightarrow} A \overset{21}{\to}$

Clearly, number of persons in the queue = (3+1+8+1+5+1+21=) 40

Case II: $\overset{3}{\leftarrow} C A \overset{5}{\leftrightarrow} B$

Number of persons between A and C

= (8 - 6) = 2

$∵ [C \overset{8}{\leftrightarrow} B A \overset{21}{\to} B]$

Clearly number of persons in the queue = (3+1+2+1+21) = 28

Now, 28 < 40. So, 28 is the minimum number of persons in the queue.

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Q:

In a class of 180, where girls are twice the number of boys, Rupesh[a boy] ranked 34th from the top. If there are 18 girls ahead of Rupesh, how many boys are after him in rank?

A) 45	B) 44
C) 60	D) can't be determined

Answer & Explanation Answer: B) 44

Explanation:

No. of boys up to the 34th rank = 34-18 = 16

Total no of boys = 180x1/2+1 = 60

number of boys after the rank of Rupesh = 60 - 16 = 44

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Q:

In this question ,there is a word writen in capital letter, with one letter underlined. For each letter in that word there is a code written. That code is denoted by either 1 , 2, 3, 4 or 5 notin the same order. you have to find out the exact code for the underlined letter in the word. The number of that code is the answer.

$\underline{F}\;L\; I\; E\; S$

1. N 2. G 3. P 4. F 5. C

Answer

Answer : 5

Explanation : Given that, For each letter in the word (FLIES) there is a code written and also that code is denoted by either 1 , 2, 3, 4 or 5

Apply the below code, It exactly matches the Given Condition

Letters at odd- numbered places shift three positions backward and letters at even-numbered places shift two positions forward as in English alphabet.

$\therefore \: \:\: \: \: \begin{matrix} F& L& I& E& S\\ 1& 2& 3& 4& 5 \end{matrix}\: \: \: \: \: \Rightarrow \: \: \: \: \: \begin{matrix} C & N & F & G & P\\ & & & & \end{matrix}$

Here, Odd- Numbered Places F, I , S shift three positions backward in English Alphabet.

Even- Numbered Places L, E shift two positions forward in English Alphabet.

Therefore, exact code for the underline letter (F) is C.

So the Answer is 5.

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Subject: Coding and Decoding

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