Discussion Forum



Find the missing term in the following series.

1)

1, 6, 15, ?, 45, 66, 91 


A) 25

B) 26

C) 27

D) 28

Answer:

Option D

Explanation:

Clearly, the given sequences follows the pattern: +5, +9, +13, +17, +21, +25, .........

Thus, 1 + 5 = 6, 6 + 9 = 15, .....

So, missing term  = 15+13=28

Hence, the answer is(d) .