CBSE BOARD X, asked by Akilaadhithan, 8 months ago

find ( 4 - [ 1/n ] ) + ( 7 - [ 2/n ] ) + ( 10 - [ 3/n ] ) + ...... upto n terms

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Answered by email2abinanthan

1

Answer:

$\frac{3 {n}^{2} + 4n - 1}{2}$

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