Math, asked by alpana2002, 1 year ago

plz solve it important

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Answered by ydharmendra888

210=10/2(2a+(10-1)*d)
210=5(2a+9d)
2a+9d=42.....(i)
Now
2565=15/2(2a+14d)
171=a+7d.......(ii)
From i and ii
2a+9d=42
2a+14d=342
______
-5d=-300
d=60
2a+9*60=42
2a=42-540
2a=-498
a=-249
So ap is - 249,-189,-129,......

alpana2002: .st

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