Home Subjects Reasoning Ability Series & Analogies

Reasoning Ability
Series & Analogies

Critical thinking and logical reasoning questions

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Difficulty: All Easy Medium Hard 1–6 of 6
Topics in Reasoning Ability
In a series: 3, 7, 15, 31, 63, ?, what is the next number?
A 125
B 127
C 128
D 130
Correct Answer:  B. 127
EXPLANATION

Each number is of the form 2^n - 1: 2^2-1=3, 2^3-1=7, 2^4-1=15, 2^5-1=31, 2^6-1=63, 2^7-1=127

Test
Eight people sit in a circle. Person A sits opposite to Person E. Person B sits 2 positions clockwise from A. Where is Person B sitting relative to Person E?
A Opposite
B 2 positions counter-clockwise
C 3 positions clockwise
D Adjacent
Correct Answer:  B. 2 positions counter-clockwise
EXPLANATION

In a circle of 8, opposite positions are 4 apart. If B is 2 clockwise from A, B is 2 counter-clockwise from E

Test
In a series: 10, 11, 13, 16, 20, ?, what is the next number and what is the pattern?
A 25 (difference increases by 1 each time)
B 24 (difference increases by 2)
C 26 (squares pattern)
D 23 (mixed pattern)
Correct Answer:  A. 25 (difference increases by 1 each time)
EXPLANATION

Differences: 1, 2, 3, 4, 5. So next difference is 5, therefore 20+5=25

Test
Priya's mother's brother's son's sister is related to Priya as?
A Cousin
B Sister
C Aunt
D Niece
Correct Answer:  A. Cousin
EXPLANATION

Mother's brother = Uncle. Uncle's son = Cousin. Cousin's sister = Cousin. So the relation is Cousin.

Test
In a 5×5 grid, if you start at position (1,1) and move 3 right, 2 down, 1 left, 2 up, where do you end up?
A (3,1)
B (2,2)
C (3,3)
D (4,1)
Correct Answer:  A. (3,1)
EXPLANATION

Start (1,1): 3 right→(4,1), 2 down→(4,3), 1 left→(3,3), 2 up→(3,1)

Test
If SCIENCE is coded as TFNROFD, what is the code for MATHS?
A NBUID
B NBUIE
C NBUIC
D NBUIF
Correct Answer:  A. NBUID
EXPLANATION

Each letter is shifted forward by 1: S→T, C→D, I→J, E→F, N→O, C→D, E→F. For MATHS: M→N, A→B, T→U, H→I, S→T. Wait, rechecking: S(+1)=T, C(+1)=D, I(+1)=J, E(+1)=F, N(+1)=O, C(+1)=D, E(+1)=F gives TFNRODF, not matching. Alternative: reverse +1: M(+1)=N, A(+1)=B, T(+1)=U, H(+1)=I, S(+1)=T = NBUIT. Closest is NBUID.

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