(6n^2 + 6n) = 6n(n + 1), which is divisible by both 6 and 12, since n(n+1) is always even.
If n is a natural number, then (6n^2 + 6n) is always divisible by
Options:
(A) 6 only
(B) 6 and 12 both
(C) 12 only
(D) 18 only
(E) 12 and 18 both
(B)

2/3 * 6/7 * 1/3 * 1/8 = 1/42
The compound ratio of 2/3, 6/7, 1/3 and 1/8 is given by?
Options:
(A) 1/48
(B) 1/42
(C) 1/46
(D) 1/47
(E) 1/43
(B)

Area of an equilateral triangle = 3/4 S2
If S = 8, Area of triangle = 3/4 * 8 * 8 = 163 cm2;
What is the are of an equilateral triangle of side 8 cm?
Options:
(A) 645
(B) 649
(C) 163
(D) 643
(E) 642
(C)