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

Find the missing term: 1, 3, 6, 10, 15, ?
A. 19
B. 18
C. 21
D. 20
Answer: Option C
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.

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Practice More Mental Reasoning Questions

Question #1
Statements: All cups are plates. Some plates are bowls. Conclusions: I. Some bowls are cups. II. Some plates are cups.
A. Only I follows
B. Both follow
C. Neither follows
D. Only II follows

Correct Answer: Option D


Explanation:
All cups are plates ⇒ Some plates are cups. Some plates are bowls does not imply some bowls are cups. Only II.

This question belongs to: Reasoning Mental Reasoning
Question #2
If the following words are arranged in alphabetical order, which word will come in the middle? Queen, Quiet, Quack, Quilt, Quote
A. Quiet
B. Quilt
C. Queen
D. Quote

Correct Answer: Option B


Explanation:
Alphabetical: Quack, Queen, Quiet, Quilt, Quote. Middle is Quiet? Positions: 1 Quack, 2 Queen, 3 Quiet, 4 Quilt, 5 Quote. Middle Quiet. Option A.

This question belongs to: Reasoning Mental Reasoning
Question #3
If 'A × B' means A is to the south of B; 'A + B' means A is to the north of B; 'A $ B' means A is to the east of B; 'A % B' means A is to the west of B; then in P % Q + R $ S, S is in which direction with respect to Q?
A. North-West
B. North-East
C. South-East
D. South-West

Correct Answer: Option C


Explanation:
P is west of Q. Q is north of R. R is east of S. So S is west of R, R is south of Q, so S is south-west of Q? From Q south to R, then west to S, so S is South-West of Q. Option A.

This question belongs to: Reasoning Mental Reasoning