Show that the sum of (m+n)^th and (m-n)^th terms of an A.P. is equal to the twice of the m^th term

Show that the sum of (m+n)^th and (m-n)^th terms of an A.P. is equal t

1.	Show that the sum of (m+n)^th and (m-n)^th terms of an A.P. is equal to the twice of the m^th term
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