Question

the sum of first n term of an ap is 210 and first N -1 term is 171 of an ap first term is 3 find the common difference​

Answer 1

Sum of n term of AP is=210

Sum of (n-1) term of AP is =171

A(first term)=3

D(Common difference) =?

D=sum of n term -( sum of (n-1) term)

D=210-171

D=39