Five marks example problems III — task. Mathematics State Board, Class 10.

UPSKILL MATH PLUS

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The

$13^{th}$ term of an A.P. is

$3$ and the sum of first

$13$ terms is

$234$ . Find the common difference and the sum of the first

$21$ terms.

Answer:

Common difference

$=$

$\frac{i}{i}$

The sum of first

$21$ terms

$=$

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