Question

if A=(1234) then the number of subsets of A contain the element 3 is

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Answer 1

Answer:

Set A has 3 elements as 3,4 are combined together as one element.

Number of non empty proper subsets of a set with n elements is =2

n −2

So, Number of non empty proper subsets of a set with 3 elements is =23 −2=8−2=6

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Answer 2

Answer:

there is a formula for number of subsets that is

2^n-1

since,n=4

{according to question}

2^4-1

2^3

8

hope you understood

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