7200 ÷ 18 × 0.2 is equal to
If n (A) = 20; n (B) = 8; n (A ∪ B) = 28, then n (A ∩ B) is
(2 + 3) + 5 = 2 + (3 + 5) obey the law of
Number of subsets of a set contains “n” elements is
If 3p = 5q, then what is p : q ?