Exemplar exercise problem VI — task. Mathematics CBSE, Class 10.

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Find the sum:

1.

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

$n$ terms

The sum of the terms

$=$

$\frac{i i - i}{i}$ .

2.

$\frac{a-b}{a+b} + \frac{3a-2b}{a+b} + \frac{5a-3b}{a+b}+...$ upto

$11$ terms

The sum of the terms

$=$

$\frac{i (i i - i i)}{i + i}$ .

[Note: Enter the coefficient and variable in separate answer box.]

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