Q. 21. Complete the series: 5, 16, 50, 153, __
(A) 459
(B) 306
(C) 463
(D) 362
Answer:
(C) 463
Explanation:
The pattern is
, where
increments by 1.
;
;
;
.
Q. 22. If $\div$ means +, – means $\div$, $\times$ means – and + means $\times$, then $32 \div 8 – 4 \times 12 + 4 =$
(A) 12
(B) 1/12
(C) 40
(D) -14
Answer:
(D) -14
Explanation:
Applying the substitutions based on the intended test logic:
. Applying BODMAS:
.
Q. 23. If , , , The missing number is:
(A) 3
(B) 14
(C) 7
(D) 10
Answer:
(B) 14
Explanation:
The pattern is
.
For
:
.
For
:
.
For
:
.
Q. 24. Pick the number that is different from the rest:
(A) 729
(B) 216
(C) 343
(D) 481
Answer:
(D) 481
Explanation:
729 (
), 216 (
), and 343 (
) are all perfect cubes. 481 is not a perfect cube.
Q. 25. A is three years older than B and three years younger to C. B and D are twins. How many years older than D is C?
(A) 2
(B) 3
(C) 6
(D) 12
Answer:
(C) 6
Explanation:
, and
. Since
, we have
. Therefore,
, meaning
. C is 6 years older than D.
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