Question

Find the sum of the ap a+b ,a-b,a-3b ...,to 22terms

Answer 1

Answer:

Step-by-step explanation:

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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