In an AP the sum of the first 10 term is minus 150 and the sum of the next 10 term is minus 550 find the AP
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MitaliRampal:
Sorry Girl. My solution is wrong.I just reviewed it...actually I was in a hurry. But now that you've got your answer.☺
it's ok
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Answer:
Step-by-step explanation:
n = no. Of terms
Sn = n/2(2a + (n-1)d)
10/2(2a+9d)
= 5(2a+9d)= -150
2a+9d= 30_eq1
20/2 (2a+19d)=-700
2a+19d=-70_eq2
Eliminating eq1 and eq2
-10d= 40
d= -4
2a -36=-30
2a=6
a=3
Therefore the AP is 3,-1,-5,-9........
thanks
It's okay... happy that u found it useful
ya
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