Explanation
bN = {bx/x ∈ N} = the set of positive integer multiples of b cN = {cx/x ∈ N} = the set of positive interger multiples of c ∴ bn ∩ cN = the set of positive integer multiples of bc = bcN [∵ b and c are prime] Hence d = bc
X = {(1, 2, 7), (1, 3, 6), (1, 4, 5), (2, 3, 5)} element of X which belong to Y are (1, 4, 5) and (2, 3, 5) both so they belong to X ∩ Y
A is empty set then n(P(A)) = 1
5 = 2(m) – 5 ∴ m = 5 n = 2(6) – 5 ⇒ n = 7
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