Discussion Forum



Given series formed in definite pattern and next number follows the predecessor. 

1)

Find the next number of the series 15,35,77.....


A) 143

B) 134

C) 105

D) 95

Answer:

Option A

Explanation:

$15=3\times5$
$35=5\times7$
$77=7\times11$
So, the next number should be product of 11 & 13 is 143.