Answer- Option A
Explanation-
Required numbers are 12, 18, 24,....., 96.
This is an A.P. in which a = 12, d = 6 and l = 96.
Let the number of terms in it be n. Then
t
n = 96
a + (n - 1)d = 96
12 + (n - 1) x 6 = 96
(n - 1) x 6 = 84
n = 15.
Required sum =
n
2 |
(a + l) =
15
2 |
(12 + 96) = 810.
Sum = 
