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Q:

How many combinations of two-digit numners having 8 can be made from the following numbers?

8, 5, 2, 1, 7, 6

A) 10 B) 6
C) 9 D) 11

Answer:   D) 11



Explanation:

The possibe two-digit numbers are: 88, 85, 82, 81, 87, 86, 58, 28, 18, 78, 68

These are 11 in number

Q:

In the following series of numbers, howmany 1, 3, 7 have appeared together. 7 being in middle and 1, 3 on either side of ??

2  9  7  3  1  7  3  7  7  1  3  3  1  7  3  8  5  7  1  3  7  7  1  7  3  9  0  6

A) 4 B) 5
C) 3 D) More than 5
 
Answer & Explanation Answer: C) 3

Explanation:

3  1  7  3  7

3  1  7  3  8

7  1  7  3  9

At these places 1, 7, 3 appeared together

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9 2424
Q:

How many 4's are there preceded by 7 but not followed by 3?

5  9  3  2  1  7  4  2  6  9  7  4  6  1  3  2  8  7  4  1  3  8  3  2  5  6  7  4  3  9  5  8  2  0  1  8  7  4  6  3

A) Four B) Three
C) Six D) Five
 
Answer & Explanation Answer: A) Four

Explanation:

7  4  2

7  4  6

7  4  1

7  4  6

 

Only at these placees 4 is preceded by 7 but not followed by 3

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885 96290
Q:

Which is the third number to the left of the number which is exactly in the middle of the following sequence of numbers?

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

A) 3 B) 5
C) 4 D) 7
 
Answer & Explanation Answer: C) 4

Explanation:

There are 27 numbers in the given sequence 

So, middle number = 14th number = 9

Clearly, the third number to the left of this 9 is 4

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18 7326