Question

19. What is the sum of the first 25 terms of the AP : -10, -7, -4....?​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

650

Step-by-step explanation:

$\bold{ s_{n} = \frac{n}{2}(2a + (n - 1)d) }$

$\bold{ s_{25} = \frac{25}{2} (2( - 10) + (25 - 1)(3))}$

$\bold{ = \frac{25}{2} ( - 20 + 72)}$

$\bold{ = \frac{25}{2} \times 52}$

$\bold{ s_{25} = 650}$