2.5 + 5.8 + 8.11+ ....... n terms find d sum
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d=5.8-2.5= 3.3
sn= n/2(2a+(n-1)d)
=n/2(2*2.5+(n-1)3.3)=n/2(5+3.3n-3.3)
=n/2(1.7+3.3n)=3.3n2/2+1.7n/2
sn= n/2(2a+(n-1)d)
=n/2(2*2.5+(n-1)3.3)=n/2(5+3.3n-3.3)
=n/2(1.7+3.3n)=3.3n2/2+1.7n/2
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