Question

Find the sum of the following APs : (1) 2,7,12,...,to 10terms.

Answer 1

Answer:

S = 245

Step-by-step explanation:

Here , a = 2 , n = 10 , d = 5

Sum of A.P.

S = n/2 [2a + (n − 1) × d]

S = 10/2 [2×2 + (10 − 1) × 5]

S = 5 [4 + 9 × 5]

S = 5 [4 + 45]

S = 5 [49]

S = 245