find sum of series 3+7+11_ _ _to30terms
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3+7+11+15+19+23+27+31+35+39+43+47+51+55+59+63+67+71+75+79+83+87+91+95+99+103+107+111+115+119 = 1830.......
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Here, a=3, d=7-3=4
So, S30= n/2{2a+(n-1)d}= 30/2{6+29×4}=15(6+116)=15×116=1740
So, S30= n/2{2a+(n-1)d}= 30/2{6+29×4}=15(6+116)=15×116=1740
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