Find the missing term: 3, 7, 15, 31, 63, ? MCQ with Answer and Explanation

Find the missing term: 3, 7, 15, 31, 63, ?
A. 127
B. 125
C. 129
D. 131
Answer: Option A
Solution (By JKSSB Mock Tests)
Each term is multiplied by 2 and 1 added: 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63, so 63×2+1=127.

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Practice More Mental Reasoning Questions

Question #1
A girl starts walking towards east. After 10 m she turns left and walks 10 m, then turns left and walks 10 m, then turns left and walks 10 m. How far is she from the starting point?
A. 20 m
B. 10 m
C. 30 m
D. 0 m

Correct Answer: Option D


Explanation:
She completes a square path and returns to the starting point, so the distance is 0 m.

This question belongs to: Reasoning Mental Reasoning
Question #2
Statements: All pens are pencils. Some pencils are erasers. Conclusions: I. Some pens are erasers. II. All pencils are pens. III. Some erasers are pencils. Which conclusion follows?
A. Only III
B. None
C. Both I and II
D. Only I

Correct Answer: Option A


Explanation:
From 'Some pencils are erasers' we can convert it to 'Some erasers are pencils'. Conclusion I does not follow because pens may be among pencils that are not erasers.

This question belongs to: Reasoning Mental Reasoning
Question #3
A clock shows 8:20. What is the angle between its hands?
A. 130°
B. 120°
C. 110°
D. 140°

Correct Answer: Option A


Explanation:
Hour hand = 8×30 + 20×0.5 = 250°, minute hand = 120°, difference = 130°.

This question belongs to: Reasoning Mental Reasoning