Question

the first term of an A.P is 6 and common difference is 3 .find s25​

Answer 1

Answer:

since ,a=6 , d=3

we need to find S27=?

HERE, Sn=n/2{2a+{n-1}d}

               =27/2{2×6+{27-1}3}

               =27/2{12+26×3}

               =27/2{90}

               =27×45

                =1215

hence sum to 27 terms is 1215

Step-by-step explanation: