Is (7 x 5 x 3 X 2 + 3) a composite number? Justify your answer.
(7 x 5 x 3 x 2 + 3) = (210 + 3) = 213
And 213 = 71 x 3
As, this number is expressible as product of two no's other, the given number is composite.
[Composition no's are those no's which has factors other than 1 and itself]