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

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

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