Find the next number: 4, 5, 12, 39, 160, ? MCQ with Answer and Explanation

Find the next number: 4, 5, 12, 39, 160, ?
A. 810
B. 805
C. 820
D. 815
Answer: Option B
Solution (By JKSSB Mock Tests)
Pattern: ×1+1, ×2+2, ×3+3, ×4+4, ×5+5: 4×1+1=5, 5×2+2=12, 12×3+3=39, 39×4+4=160, 160×5+5=805.

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Practice More Mental Reasoning Questions

Question #1
If in the word 'DISTURBANCE', the first letter is interchanged with the last letter, the second letter is interchanged with the tenth letter and so on, which letter would come after the letter 'T' in the newly formed word?
A. N
B. I
C. S
D. U

Correct Answer: Option A


Explanation:
Word: D I S T U R B A N C E (11 letters). Interchange 1-11, 2-10, 3-9, 4-8, 5-7, middle 6 remains. New: E C N A B R U T S I D. After T is S. Options have S. So C.

This question belongs to: Reasoning Mental Reasoning
Question #2
In a row, R is 7th from left and S is 10th from right. If they interchange, R becomes 12th from the left. How many persons are in the row?
A. 21
B. 19
C. 20
D. 22

Correct Answer: Option A


Explanation:
S's original left position is R's new left position, 12. Total = 12 + 10 - 1 = 21.

This question belongs to: Reasoning Mental Reasoning
Question #3
Find the odd one out: 121, 144, 169, 196, 225, 256
A. 169
B. 121
C. 196
D. None of these

Correct Answer: Option D


Explanation:
All are perfect squares: 11²,12²,13²,14²,15²,16². No odd one.

This question belongs to: Reasoning Mental Reasoning