Question
Mathematics Question on Arithmetic Progression
If a1, a2, a3,..., an are in A. P. with a1 = 3, an, = 39 and a1+a2+...+an = 210, then the value of n is equal to
A
8
B
10
C
11
D
13
E
15
Answer
10
Explanation
Solution
The correct option is (B): 10