What is the next number in the series: 6, 11, 21, 40, 77, ? MCQ with Answer and Explanation

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What is the next number in the series: 6, 11, 21, 40, 77, ?

A. 152

B. 151

C. 149

D. 150

Answer: Option C

Solution (By JKSSB Mock Tests)

Pattern: ×2 −1, ×2 −1, ×2 −2, ×2 −3, ×2 −5? 6×2−1=11, 11×2−1=21, 21×2−2=40, 40×2−3=77, 77×2−5=149 (subtracted numbers 1,1,2,3,5 Fibonacci).

This question belongs to: Reasoning Mental Reasoning

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Practice More Mental Reasoning Questions

Question #1

What is the angle between the hands of a clock at 6:00?

A. 150°

B. 90°

C. 180°

D. 120°

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Correct Answer: Option C

Explanation:
At 6:00, the hour hand is at 6 and the minute hand is at 12, exactly opposite; angle = 180°.

This question belongs to: Reasoning Mental Reasoning

Question #2

Find the missing term: 2, 3, 10, 39, ?

A. 168

B. 172

C. 180

D. 160

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Correct Answer: Option B

Explanation:
Pattern: ×1+1=3, ×2+4=10, ×3+9=39, so next is ×4+16=172.

This question belongs to: Reasoning Mental Reasoning

Question #3

Find the missing term: 3, 12, 48, 192, ?

A. 864

B. 576

C. 768

D. 672

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Correct Answer: Option C

Explanation:
Each term is multiplied by 4: 3×4=12, 12×4=48, 48×4=192, so next is 192×4=768.

This question belongs to: Reasoning Mental Reasoning

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