Q. 264.5( 2 Votes )

# Mark the correct

Answer :

If elements are not repeated then number of elements in A1A2A3….A30=30*5=150

But, each element of S is in 10 of  If elements are not repeated then number of elements in B1B2B3….Bn=3*n

But, each element of S is in of   3× n=15× 9

n=45

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