please solve this question
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Step-by-step explanation:
let common difference =d
Am+n = a + d(m+n-1)
Am-n = a +d (m-n-1)
Am+n + Am-n =
=2a +d(m+n-1) +d(m-n-1)
= 2a +2dm -2d
=2 (a +dm-d)
= 2 [(a +d (m-1)]
= 2Am
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