Show that the sum of (m+n)th and (m-n)th terms of an AP is equal twice

1.	Show that the sum of (m+n)th and (m-n)th terms of an AP is equal twice to mth term
Answer» (m+n)th term is a+(m+n-1)d and (m-n)th term is a+(m-n-1)d and mth term is a+(m-1)d .now add both of them a+(m+n-1)d+a+(m-n-1)d =2 (a+(m-1)d)

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