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 Number Series Questions

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Q:

Find out the wrong term in the series 3, 7, 15, 39, 63, 127, 255, 511

A) 39 B) 255
C) 127 D) 63
 
Answer & Explanation Answer: A) 39

Explanation:

The correct pattern is *2+1
So, 39 is wrong and must be replaced by (15 * 2 + 1) = 31

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21 9569
Q:

Find the wrong number in the given series :

26, 20, 16, 11, 8, 6, 5

A) 5 B) 26
C) 11 D) 16
 
Answer & Explanation Answer: D) 16

Explanation:

26 - 6 = 20

20 - 5 = 15

15 - 4 = 11

11 - 3 = 8

8 - 2 = 6

6 - 1 = 5

Therefore, 16 is wrong number.

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Exam Prep: GATE , CAT , Bank Exams , AIEEE
Job Role: Bank PO , Bank Clerk

23 9421
Q:

Choose the missing terms out of the given alternatives T, R, P, N, L, ?, ?

A) K,I B) J, H
C) J, G D) K, H
 
Answer & Explanation Answer: B) J, H

Explanation:

T - 2 = R
R - 2 = P
P - 2 = N
N - 2 = L
L - 2 = J
J - 2 = H

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Filed Under: Number Series

35 9115
Q:

Choose the correct alternative that will continue the same pattern and replace 'x' in series 5,15,17,85,89,623,x

A) 825 B) 759
C) 629 D) 675
 
Answer & Explanation Answer: C) 629

Explanation:

The pattern is *3,+2,*5,+4,*7,+6, . . . . .
So missing term is 623+6=629

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Filed Under: Number Series

15 9052
Q:

Choose the missing terms out of the given alternatives ATTRIBUTION, TTRIBUTIO, RIBUTIO, IBUTI

A) IBU B) UT
C) BUT D) UTI
 
Answer & Explanation Answer: D) UTI

Explanation:

In the first step, one letter from the beginning and one from the end of a term are removed to give the next term . In the second step, two letters from the beginning of the term are removed. These two steps are repeated alternatively

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38 8701
Q:

Choose the correct alternative that will continue the same pattern and replace the 'x' in the series 525, 430, 345, 270, x

A) 255 B) 205
C) 235 D) 175
 
Answer & Explanation Answer: B) 205

Explanation:

The pattern is -95, -85, -75, -65, . . . .

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Filed Under: Number Series

32 8630
Q:

_ tu _ rt _ s _ _ usrtu _

A) rsutrr B) rsurtr
C) rsurts D) rtusru
 
Answer & Explanation Answer: C) rsurts

Explanation:

The series rtus/rtus/rtus/rtus. Thus, the pattern 'rtus' is repeated.

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Exam Prep: AIEEE , Bank Exams , CAT , GATE , GRE , TOEFL
Job Role: Bank Clerk , Bank PO

22 8386
Q:

Find out the wrong term in the series 125, 126, 124, 127, 123, 129

A) 129 B) 125
C) 127 D) 123
 
Answer & Explanation Answer: A) 129

Explanation:

The correct pattern is +1, -2, +3, -4, +5, . . . .
So,129 wrong and must be replaced by 123 + 5 = 128

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Filed Under: Number Series

17 8373