Find the missing term: 1, 3, 6, 10, 15, ? MCQ with Answer and Explanation

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Find the missing term: 1, 3, 6, 10, 15, ?

A. 21

B. 20

C. 19

D. 18

Answer: Option A

Solution (By JKSSB Mock Tests)

Triangular numbers: n(n+1)/2. 1, 3, 6, 10, 15 correspond to n=1 to 5, so next is 6×7/2=21.

This question belongs to: Reasoning Mental Reasoning

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Question #1

Find the missing term: 7, 16, 29, 46, ?

A. 61

B. 65

C. 63

D. 67

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Correct Answer: Option D

Explanation:
Differences are +9, +13, +17, which increase by 4; next difference is +21, so 46+21=67.

This question belongs to: Reasoning Mental Reasoning

Question #2

Find the missing term: 2, 3, 5, 9, 17, ?

A. 31

B. 33

C. 34

D. 32

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Correct Answer: Option B

Explanation:
Each term is multiplied by 2 and then 1 is subtracted: 2×2-1=3, 3×2-1=5, 5×2-1=9, 9×2-1=17, so next is 17×2-1=33.

This question belongs to: Reasoning Mental Reasoning

Question #3

If 'RAT' is coded as 'IZG', then 'COW' is coded as?

A. XLD

B. XLE

C. XMD

D. WLD

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Correct Answer: Option A

Explanation:
Reverse letter coding: R→I, A→Z, T→G; C→X, O→L, W→D, so COW = XLD.

This question belongs to: Reasoning Mental Reasoning

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