Question

if the sum of first p term of an AP is 2p²+p then find it's first term

Answer 1

given , sum of first "p" terms

(sum)Tp= 2p^2 + p ---(1)

let p= 1, 2 3....
put p = 1 in eq.(1), we get

T1 = 2p ^2 + p = 2(1)^2 + 1

T1= 2+1 = 3
hence the first term( T1) = 3

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