ISRO | ISRO CS 2017 | Question 8

The number of elements in the power set of { {1, 2}, {2, 1, 1}, {2, 1, 1, 2} } is

(A) 3
(B) 8
(C) 4
(D) 2

Answer: (D)
Explanation: This set has only one element because of no order and identical elements.
So, total number of elements in power set of given set = 2ⁿ = 2¹ = 2

So, option (D) is correct.
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