GATE | GATE CS 2020 | Question 7

If P=3, R=27, T=243, then Q+S = ________ .
(A) 40
(B) 80
(C) 90
(D) 110


Answer: (C)

Explanation: Given, sequence is in n-th power of 3. Starting from n=1 and position ‘P’ alphabetically order.

P = 31 = 3 
Q = 32 = 9
R = 33 = 27
S = 34 = 81
T = 35 = 243 

Therefore,

Q+S = 9+81 = 90 

Option (C) is correct.

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