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Q:

On the occasion of New Year, each student of a class sends greeting cards to the others. If there are 21 students in the class, what is the total number of greeting cards exchanged by the students?

A) 380	B) 420
C) 441	D) 400

Answer & Explanation Answer: B) 420

Explanation:

Given total number of students in the class = 21

So each student will have 20 greeting cards to be send or receive (21 - 1(himself))

Therefore, the total number of greeting cards exchanged by the students = 20 x 21 = 420.

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Filed Under: Permutations and Combinations
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Q:

7 9 19 18 31 29

Find the odd number in the given Number Series?

A) 31	B) 29
C) 18	D) 19

Answer & Explanation Answer: B) 29

Explanation:

Here the given number series follows a pattern of two alternate series.

1. 7 19 31 ...(Difference of 12)

2. 9 18 27 ...(Difference of 9)

Here the odd number is 29 instead of 27

And the next number is 31 + 12 = 43 & 27 + 9 = 36

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Filed Under: Odd Man Out
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Q:

9 17 11 19 13

What Are The Next Three Numbers In The Given Number Series?

A) 17, 10, 18	B) 19, 14, 23
C) 21, 15, 23	D) 19, 13, 22

Answer & Explanation Answer: C) 21, 15, 23

Explanation:

Given number series is 9 17 11 19 13

Here the pattern is

9

9 + 8 = 17

17 - 6 = 11

11 + 8 = 19

19 - 6 = 13

13 + 8 = 21

21 - 6 = 15

15 + 8 = 23

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Q:

A certain job was assigned to a group of women to do it in 20 days. But 12 women did not turn up for the job and the remaining did the job in 32 days. The original number of women in the group was?

A) 36	B) 32
C) 22	D) 28

Answer & Explanation Answer: B) 32

Explanation:

Let the total women in the group be 'W'

Then according to the given data,

W x 20 = (W-12) x 32

=> W = 32

Therefore, the total number of women in the group = 32

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Filed Under: Time and Work
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Q:

Find the Next Number in the given number series?

3, 10.5, 36.75, 128.625, ?

A) 450.187	B) 442.151
C) 441.231	D) 456.852

Answer & Explanation Answer: A) 450.187

Explanation:

Pattern is

3

3 x 3.5 = 10.5

10.5 x 3.5 = 36.75

36.75 x 3.5 = 128.625

128.625 x 3.5 = 450.187

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Q:

2.5, 3.5, 9, 40, ?

Find the next number in the above-given series?

A) 316	B) 328
C) 323	D) 340

Answer & Explanation Answer: B) 328

Explanation:

2.5 × 1 + 1 = 3.5

3.5 × 2 + 2 = 9

9 × 4 + 4 = 40

40 × 8 + 8 = 328

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Q:

1, 2, 8, 33, ?

Find the next number in the given series?

A) 148	B) 145
C) 143	D) 141

Answer & Explanation Answer: A) 148

Explanation:

1 x 1 + 1 x 1 = (1 + 1) = 2

2 x 2 + 2 x 2 = (4 + 4) = 8

8 x 3 + 3 x 3 = (24 + 9) = 33

33 x 4 + 4 x 4 = (132 + 16) = 148

148 x 5 + 5 x 5 = (740 + 25) = 765.

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Q:

6, 3, 3, 6, 24, ?

Find the next number in the given number series?

A) 192	B) 186
C) 182	D) 194

Answer & Explanation Answer: A) 192

Explanation:

Given

6 3 3 6 24 ?

Here

6

6 x 0.5 = 3

3 x 1 = 3

3 x 2 = 6

6 x 4 = 24

24 x 8 = 192

The next number in the given series is 192.

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