the AP and was the fourth term is minus 15 and the 9th term is -13 find the sum of the first 10 numbers
anshu77777:
please solve....... its urgent
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a plus 3d = - 15 ..........(1)
a plus 8d = - 13 ..........(2)
Solve these equations , then you'll get the value of 'a' and 'd'.
Then use the formula , Sn = n/2 [2a plus (n-1) d]
Here, n= 10.
Hope these tips help !! ✌
a plus 8d = - 13 ..........(2)
Solve these equations , then you'll get the value of 'a' and 'd'.
Then use the formula , Sn = n/2 [2a plus (n-1) d]
Here, n= 10.
Hope these tips help !! ✌
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