If the nth term of an A.P is 7 - 3n find the sum of 25 terms
Answers
Answered by
0
n=7-3n
s25=?
n=1,a=7-3=4
a25=7_3×25=-68
sn=n÷2[a+an]
S25=25÷2×4+-68
=25÷2×-64
= 25×-32
-800
plz mark it as branilst
Similar questions