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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