Find the sum of first 25 sum of an AP, Nth term is given by n = 3n+2
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given n = 25
and expression for term is given by n= 3n + 2
for n = 1
Tn = 3× 1 +2
T1= 5
and n = 25
T25 = 3× 25 +2
T25 = 77
and we knew that Sn = n/2×(a+l)
Sn = 25× 82/2
answer is
Sn = 1025
and expression for term is given by n= 3n + 2
for n = 1
Tn = 3× 1 +2
T1= 5
and n = 25
T25 = 3× 25 +2
T25 = 77
and we knew that Sn = n/2×(a+l)
Sn = 25× 82/2
answer is
Sn = 1025
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