Question

find the sum of5+8+ 11+ ••••to 10th terms using the formula​

Answer 1

Step-by-step explanation:

First Term= 5

Common Difference= 3

No. of terms = 10

Sum of n terms = n/2 ( 2a+(n- 1)d)

= 10/2 (2× 5+(10-1)3)

= 5(10+9× 3)

= 5(10+27)

= 5(37)

= 185 Answer