Question

the first term and common difference of an A. P is 10000 and 2000 respectively, find the sum of first 12 term of A.P​

Answer 1

Answer:

the first term and common difference of an A. P is 10000 and 2000 respectively,

$a = 10000 \\ d = 2000$

the sum of first 12 term of A.P

$s = \frac{12}{2} \times ({2a + }(12 - 1) \times d \\ s = 6 \times (2 \times 10000 + 11 \times 2000) \\ s = 6 \times (20000 + 22000) \\ s = 6 \times 42000 \\ s = 252000$