Find S5 of the A.P. 8, 6, 4, ... .
Answers
Answered by
3
a=8 , l=0 ( last term )
n=5
Sn=n/2(a+l)
Sn=5/2(8)
Sn=20
S5=20
Answered by
3
Answer:
a= 8
d= a2 - a1
= 6 - 8 = -2
we have to find sum of 5 term
so, Sn = n/2(2a+(n-1)d)
=5/2(2×8+(5-1) -2
=5/2(16+(-8)
=5/2×8
=20 ans
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