Find the missing term: 2, 3, 5, 7, 11, ? MCQ with Answer and Explanation

Find the missing term: 2, 3, 5, 7, 11, ?
A. 15
B. 12
C. 17
D. 13
Answer: Option D
Solution (By JKSSB Mock Tests)
The series contains consecutive prime numbers: 2, 3, 5, 7, 11, and the next prime is 13.

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Practice More Mental Reasoning Questions

Question #1
Find the next term: 5, 11, 23, 47, 95, ?
A. 191
B. 185
C. 189
D. 183

Correct Answer: Option A


Explanation:
Pattern: multiply by 2 and add 1. 95 × 2 + 1 = 191.

This question belongs to: Reasoning Mental Reasoning
Question #2
If in a certain code, '753' means 'books are old', '365' means 'old and rare' and '473' means 'books and pens', which digit stands for 'rare'?
A. 5
B. 7
C. 6
D. 3

Correct Answer: Option C


Explanation:
From first and second, old =5 or 3. From first and third, books =7 or 3. Common analysis: first and second share 5 and 3, old common. Second and third share 3, but second has and rare old, third books and pens. 'and' common in second and third =3. Then from second, old and rare =3 6 5, and =3 so old/rare =6,5. From first, books are old =7 5 3, and =3 so books/are/old =7,5. Thus old =5, then rare =6.

This question belongs to: Reasoning Mental Reasoning
Question #3
In a row, P is 10th from the left and Q is 6th from the right. After interchanging, P is 18th from the left. How many persons are in the row?
A. 23
B. 24
C. 25
D. 22

Correct Answer: Option A


Explanation:
Q's original left position is P's new left position, 18. Total = 18 + 6 - 1 = 23.

This question belongs to: Reasoning Mental Reasoning