First slide

Introduction to sets

Question

If a set A has n elements, then the total number of subsets of A is

Easy

A

n
B

$n^{2}$
C

$2^{n}$
D

2n

Solution

$Number of subset s of A =^{n} C_{0} +^{n} C_{1} + . . . . . . . . . . +^{n} Cn = 2^{n}$

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