Question

3: internally 38. Find the sum of first 10 terms of the AP 2, 7, 12. ....​

Answer 1

Step-by-step explanation:

given a= 2

d= 5 (7-2=5)

using the formula,

$s10 = \frac{10}{2} \times (2a + (10 - 1)d)$

for summation of first 10 terms,

we get that

= 5 × ( 2(2) + (9)(5))

= 5 × (49)

= 245