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Proper Set

What is the n...

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What is the number of ordered pair (A,B) where A and B are subsets of {1,2,3,4,5} such that neither A is a proper subset of B nor B is a proper subset of A?

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Q. If A = |1, 2, 3, 4, 5|, then the number of proper subsets of A is
(a) 120
(b) 30
(c) 31
(d) 32

If A = {1,2,3,4,5}, then the number of proper subsets of A is

A = {1, 2, {3, 4}}

number of proper subsets of

A

A = {1, 2, 3, 4, 5, 6, 7}

then number of proper subsets of

A

Q. Calculate the number of proper subsets of

A

A

x : x

is a prime number,

x < 19

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