Question

find the sum of the first 22 terms 5+8+11+14.......​

Answer 1

$\huge \mathbb{ANSWER}$

$\sf{sn = \frac{n}{2}[(2a + (n + 1)d)]}$

$\sf{ = \frac{22}{2}(10 +(22 - 1)3}$

$\sf{11[(10 + 63)]}$

$\sf \red{11 \times 73}$

803

Answer 2

sum of first 22 terms is 803

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