Question

The sum of first 10 terms of ap is -150 and sum of other next 10 terms is -550 find ap

Answer 1

hi dear,
here is ur answer.............................
a+a+d+a+2d+a+3d+a+4d+a+5d+a+6d+a+7d+a+8d+a+9d=-150
10a+45d=-150
2a+9d=-30
2a=-30-9d.....................................1.
a+10d+a+11d+............................a+19d=-550
10a+145d=-550
2a+29d=-110
from 1. equation
-30-9d+29d=-110
20d=-110+30
20d=-80
d=-4
2a=-30-9d
2a=-30+36
2a=6
a=3
so,
the AP formed:
3,-1,-5......
hope it helps uh......
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Answer 2

Refers to attachment ○~