Question

Let ( quad A={1,2,3,4,5,6} )
( B={1,2,3,9,5, e 7} )
( B times A=left{begin{array}{lllll}11 & 12 & 13 & 14 & 15 & 16 21 & 22 & 23 & 24 & 25 & 26 31 & 32 & 33 & 34 & 35 & 36 41 & 42 & 43 & 44 & 95 & 46 50 & 53 & 53 & 54 & 55 & 56 71 & 72 & 73 & 74 & 75 & 76end{array}right. )
( therefore ) No. I Common elements are ( =25 )

# First Step for JEE (Main & Advanced)-2019-2021 44. If two sets A and B have 5 elements in common, then the number of elements common to each of the sets (A + B) and (B x A) is (1) 5 (2) 25 (3) 10 (4) 15

Solution