if a is subset to b and n(a)=4,n(b)=7,then n( a-b)=?
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Step-by-step explanation:
for eg =
a=( 1 ,2,3 ,4) and n(a) = 4
b= ( 1,2,3,4,5,6,7 ) and n(b) =7
a-b =( 5,6,7 ) and n (a-b) = 3
answer is 3
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