Find the sum of first 18 terms of AP whose first term is 5 and Common difference is 2
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a= 5
d= 2
n=18
by formula...
Sn = n/2 [2a+(n-1)d]
Sn = 18/2[ 2× 5+(18-1)2]
Sn = 9[10+17 × 2]
Sn = 9[ 10+ 34]
Sn = [ 9× 44]
Sn =. 396 Answer...
Hence the sum is 396........
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