If(m+1)th term is twice the (n+1)th term,prove that (3m+1)th is twice the (m+n+1)th term

If(m+1)th term is twice the (n+1)th term,prove that (3m+1)th is twice

1.	If(m+1)th term is twice the (n+1)th term,prove that (3m+1)th is twice the (m+n+1)th term
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