Question

Sum to n terms the series whose rth term is 3r - 1​

Answer 1

Answer:

n(3n+1)/2

Step-by-step explanation:

Given AP, with rth term = 3r-1

Sₙ=?

a₁= 3-1=2 & aₙ= 3n-1

Sₙ=n/2*(2+3n-1)=n(3n+1)/2

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Answer 2

Answer:

find the series whose rth term is 3r-1