let A and B be two sets containing two and four elements. then the number of subsets of set A×B each having at least three elements
a) 129
b) 912
c)219
d)291
udaysaikiran2001:
let A and B be a two sets A =4 and B= 2 = A×B.= 4×2 = 8 . = 2^8- ( 8c0 + 8c1 + 8c2) = 256- ( 1+8+28) = 256 - 37 = 219. hence option c
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option c is the right ans
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