find The sum of last 10 terms of AP - 8, 10, 12....126
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hey here ....
given a =-8.......first term
n ... number of terms = 10
so apply formula sn=n/2[ a + l ] . ......where I is the last term
..
by applying formula ...
we get
sn=10/ 2[ -8 + 126 ]..
sn=5[ 1 1 8 ]
Sn =590....
,so sum of last 10 term ' 590
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