Question

the sum of (a+b),(a-b),(a-3b),..........to 22nd term is

Answer 1

Answer:

$n/2 (2a+(n-1)d)$

$22/2 (2×(a+b)+(22-1)(-2b))$

$11 (2a+2b+21×(-2b))$

$11 (2a+2b-42b)$

$11 (2a-40b)$

$22a-440b$

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