[1/(1.2.3)] + [1/(2.3.4)] + [1/(3.4.5)] + [1/(4.5.6)] is equal to
Choose the correct choice:
A) 7 / 30
B) 11 / 30
C) 13 / 30
D) 17 / 30
E) None
Answer   Given Exp. = [(4 x 5 x 6) + (5 x 6) + (2 x 6) + (2 x 3)] / [(2 x 3 x 4 x 5 x 6)]   = 168 / (24 x 30)   = 7 / 30   Correct Option: 7 / 30
<result>A</result>
[1/(1.2.3)] + [1/(2.3.4)] + [1/(3.4.5)] + [1/(4.5.6)] is equal to