Question

7. Find the sum of first thirty terms of Arithmetic series 2 + 7 + 12 + ... using suitable formula.​

Answer 1

Answer:

S30=2235

Step-by-step explanation:

a=2 , d= 5

Sn= n/2 [2a+(n-1)d]

S30=30/2 [2×2+(30-1)×5]

S30= 15 [4+29×5]

S30=15 [4+145]

S30=15×149

S30= 2235