the sum of 8th and 3th term of the AP is 7 and the sum of the 7th and 14th term of AP is -3 . find 10th term
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a+7d+a+2d=7
2a+9d=7 - - - - - (I)
a+6d+a+13d=-3
2a+19d=-3 - - - - - -(ii)
Subtract equation I from ii we get
10d=-10 => d=-1
Putting d=-1 in any of the two equation we get
a=8
10th term=
a+9d
=8+9×-1
=-1
2a+9d=7 - - - - - (I)
a+6d+a+13d=-3
2a+19d=-3 - - - - - -(ii)
Subtract equation I from ii we get
10d=-10 => d=-1
Putting d=-1 in any of the two equation we get
a=8
10th term=
a+9d
=8+9×-1
=-1
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