Complete the series: 5, 6, 9, 15, 25, ? MCQ with Answer and Explanation

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Complete the series: 5, 6, 9, 15, 25, ?

A. 45

B. 41

C. 50

D. 40

Answer: Option B

Solution (By JKSSB Mock Tests)

Pattern: +1, +3, +6, +10, +15 (triangular numbers). 25+16? Differences of differences +2,+3,+4,+5 so next difference +15? 1,3,6,10,15. Yes 25+15=40. Option A.

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

What should come next in the following letter series? A A B A B C A B C D A B C D E A B C D

A. A

B. E

C. B

D. C

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Correct Answer: Option B

Explanation:
The series is A, AB, ABC, ABCD, ABCDE, ABCDEF... So after A B C D the next group starts with A B C D E, so next letter is E.

This question belongs to: Reasoning Mental Reasoning

Question #2

If CIRCLE is coded as EKTENG, how is SQUARE coded?

A. USWCTG

B. UTSWCG

C. USVCTG

D. USWDTG

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Correct Answer: Option A

Explanation:
Each letter is shifted 2 places forward. S+2=U, Q+2=S, U+2=W, A+2=C, R+2=T, E+2=G.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing term: 8, 27, 64, 125, ?

A. 216

B. 226

C. 206

D. 196

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Correct Answer: Option A

Explanation:
The terms are cubes: 2³=8, 3³=27, 4³=64, 5³=125, so next is 6³=216.

This question belongs to: Reasoning Mental Reasoning

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