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authorprashantsinalkar2017-10-10 12:27:19 +0530
committerprashantsinalkar2017-10-10 12:27:19 +0530
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+//chapter 1 Ex 32
+
+clc;
+clear;
+close;
+//given series is in AP in which first element a1=6, second element a2=15, last element an=105
+a1=6; a2=15; d=a2-a1; an=105;
+
+//formula for last element is a1+(n-1)*d=an; where n is number of elements in series
+n=(an-a1)/d+1;
+
+Sum=n/2*(a1+an);
+printf("The required sum is %d",Sum);