In an Ap the first term is -8 and the last term is 100
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correct question:-
In an AP if the first term is -8 and its last term is 100 then find its sum.
Given:-
- a = -8
- l = 100
to find:-
- sum of this AP
Formula:-
Solution:-
→ Sₙ =
→ Sₙ =
→ Sₙ =
→ Sₙ =
hence, the sum of the terms this ap = 46
______________________________
Additional Info.
to find nth term following formula is used:-
→ aₙ = a+(n-1)d
to find sum of the terms of A.P whose last term is not given
→ Sₙ =
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