Question

If A and B are two finite sets, then n(A) + n(B) is equal to ___________

Answer 1

$If\: A \:and\: B \:are\: two\: finite\: sets, \:then\\ n(A) + n(B) \:is \:equal\: to\\ \underline {\pink { a \: natural \:number \: (finite \: number)}}$

Example :

• Let set A = { 1,4,9,16,25}
• n(A) = number \:of \: elements \:in \:set \:A = 5

• Set B = { 1,3,5,7}
• n(B) = 4
• Now , n(A) + n(B) = 5 + 4 = 9 (Finite )

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