Find the sum of the arithmetic series 17+27+37
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Sum=n/2 [2a+(n-1)d]
a=17
d=10
Sn=n/2 [2×17+(n-1)10]
=n/2 [34+10n-10]
=n/2 [24+10n]
=n (12+5n)
a=17
d=10
Sn=n/2 [2×17+(n-1)10]
=n/2 [34+10n-10]
=n/2 [24+10n]
=n (12+5n)
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