find the sum of the given sequence uptill the nth term:1.2+2.3+3.4
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a=1.2
d=1.1
Sn=n/2(2a+(n-1)d)
=n/2 (2.4+1.1n-1.1)
= n/2 (1.1n+1.3)
1.1/2n^2+1.3/2n
d=1.1
Sn=n/2(2a+(n-1)d)
=n/2 (2.4+1.1n-1.1)
= n/2 (1.1n+1.3)
1.1/2n^2+1.3/2n
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