Question

In an A.P., the sum of the first ten terms is -150 and sum of the next ten terms is -550. Find the A.P.

Answer 1

hey mate here is a solution of ur question ✔✔

Answer 2

Answer:345, 235, 125 ,15, -95, -205, -315, -425, -535, -645, -755, -865, -975, -1085, -1195,........

Step-by-step explanation:

s10 = -150

1/2 ( 2a + 9d ) = -150

2a + 9d = -300 (1)

s20 = -150 + (-550) = -700

1/2 (2a + 19d ) = -700

2a + 19d = -1400 (2)

from (1) & (2),

10d = -1100

d = -110

putting in equation (1),

2a + 9 ( -110 ) = -300

2a - 990 = - 300

2a = 690

a = 345 Ans.

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