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Q:

What value will come in place of question mark (?) in the number - series given below ?

4, 30, ?, 1440, 7195, 71940

A) 145	B) 545
C) 650	D) 999

Answer & Explanation Answer: A) 145

Explanation:

4 30 ? 1440 7195 71940

Here the given series follows a pattern of

4

4 x 10 - 10 = 30

30 x 5 - 5 = 145

145 x 10 - 10 = 1440

1440 x 5 - 5 = 7195

7195 x 10 - 10 = 71940

Hence, the missing number is 145

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Q:

To fill 8 vacancies there are 15 candidates of which 5 are from ST. If 3 of the vacancies are reserved for ST candidates while the rest are open to all, Find the number of ways in which the selection can be done ?

A) 7920	B) 74841
C) 14874	D) 10213

Answer & Explanation Answer: A) 7920

Explanation:

ST candidates vacancies can be filled by ${}^{5}C_{3}$ ways = 10

Remaining vacancies are 5 that are to be filled by 12

=> ${}^{12}C_{5}$ = (12x11x10x9x8)/(5x4x3x2x1) = 792

Total number of filling the vacancies = 10 x 792 = 7920

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Filed Under: Permutations and Combinations
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Q:

What should come in place of question mark (?) in the following number series?

38, 195, ?, 4905, 24530, 122655

A) 980	B) 885
C) 824	D) 1021

Answer & Explanation Answer: A) 980

Explanation:

The given series follows the pattern that,

×5+5, ×5+5, ×5+5, ×5+5, ×5+5

38 x 5 + 5 = 195

195 x 5 + 5 = 980

980 x 5 + 5 = 4905

4905 x 5 + 5 = 24530

24530 x 5 + 5 = 122655

So the missing number is 980 .

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Q:

There are 1650 students in a college. The difference between the number of boys and girls in the college is 400. What is the percentage of girls in the college ?

A) 49	B) 34
C) 43	D) 38

Answer & Explanation Answer: D) 38

Explanation:

Let no. of boys be 'B' and no. of girls be 'G'

Here from given data,

B + G = 1650 .....(1)

B - G = 400 .....(2)

From (1) & (2), we get

2B = 2050

=> B = 1025

=> G = 1650 - 1025 = 625

Hence, the % of girls = 625 x 100/1650

=> 38% (approx).

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Filed Under: Percentage
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Q:

In the given numbers, if in each number first digit is replaced by the third digit, second digit is replaced by the first digit and third digit is replaced by the second digit then which number will be the biggest ?

653 749 872 933 541

A) 933	B) 872
C) 749	D) 653

Answer & Explanation Answer: C) 749

Explanation:

From the given data,

EXP.

Largest number = 974

Therefore, the required number is 749.

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Filed Under: Arithmetical Reasoning
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Q:

Read the arrangement carefully and give the answer of following questions ?

K$23DBE8HM4@5JF4%K1+WR#AA*415

How many such symbols are there which is not immediately preceded by a letter but immediately followed by a number ?

A) 1	B) 2
C) 3	D) 0

Answer & Explanation Answer: A) 1

Explanation:

Only one such symbol is there in the given arrangement.

It is 4@5.

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Filed Under: Number, Ranking and Time Sequence Test
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Q:

Find the odd one in the number series given below ?

17, 9, 10, 18.5, 35, 90

A) 9	B) 10
C) 18.5	D) 90

Answer & Explanation Answer: C) 18.5

Explanation:

The given series pattern follows

17 9 10 18.5 35 90

× 0.5 + 0.5, × 1 + 1, × 1.5 + 1.5, × 2 + 2, × 2.5 + 2.5

So here

17x0.5 + 0.5 = 9

9x1 + 1 = 10

10x1.5 + 1.5 = 16.5

16.5x2 + 2 = 35

35x2.5 + 2.5 = 90

Here the odd man in the given series is 18.5

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Q:

What will come in place of question mark (?) in the following number series?

4, 3, 4, 7, 15, ?

A) 42	B) 44
C) 53	D) 56

Answer & Explanation Answer: B) 44

Explanation:

4 3 4 7 15 ?
×1-1 ×1+1 ×2-1 ×2+1 ×3-1

15x3 - 1 = 45 - 1 = 44

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