Question

What is the number of proper subsets of seta={p,q,r}?

Answer 1

Answer:

5

Step-by-step explanation:

Formula for proper subset :

$\implies$ $\sf{no.\:of\:subsets=2n-1 }$

(n is the no. of elements in the set A)

$\implies$ $\sf{2(3)-1 }$

$\implies$ $\sf{6-1 }$

$\implies$ $\boxed{\sf{5\:Proper\:subsets} }$

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Answer 2

Answer:

7

Step-by-step explanation:

formula of proper set =2^n-1

now

n=3

=2^3-1

=8--1

7