Correct Answer: Option D
Required numbers are 10, 15, 20, 25, ..., 95
This is an A.P. in which a = 10, d = 5 and l = 95.
tn = 95
=> a + (n - 1)d = 95
=> 10 + (n - 1) x 5 = 95
=> (n - 1) x 5 = 85
=> (n - 1) = 17
=> n = 18
So, Required Sum = (n/2) x (a + l)
= (18/2) x (10 + 95)
= (9 x 105) = 945.
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