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nth Term of A.P

Find the sum ...

Question

Find the sum of the following arithmetic progressions:
$a + b, a - b, a - 3 b, . . . . .$ to $22$ terms.

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Solution

SOLUTION IS GIVEN BY
SUM OF n TERM = $(2 a + (n - 1) d)$
HENCE SUM= $2 a - 440 b$

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nth Term of A.P

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