If `P = {1,2,3,”…….”,256}` , two of its subsets are A and B. A is the set of all multiples of 3 and B is the set of all multiples of 4. Find `n(A nn B)`.
A. 21
B. 20
C. 22
D. 19
A. 21
B. 20
C. 22
D. 19
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Correct Answer – A
`A=` set of multiples of 3
B= set of multiples of 12.
`:. A nn B` = set of multiples of 12.
`= {12,24,36,”…..”252}`
`:. n(A nnB)= 21`.