If A = {1, 4, 9, 16, 25}, the number of proper subsets of A is

A 15

B 16

C 31

D 32

Solution

Correct Answer: Option C

দেওয়া আছে,
A = {1, 4, 9, 16, 25}

সেটের উপাদান সংখ্যা = 5

∴ প্রকৃত উপসেট সংখ্যা = 2n - 1
= 25 - 1
= 32 - 1
= 31

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