If the sum of first m terms of an AP is the same as the sum of its first n terms,Show that S_m+n = 0

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If the sum of first m terms of an AP is the same as the sum of its first n terms, show
that the sum of its first (m+n) terms is zero
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If the sum of first m terms of an AP is the same as the sum of its first n terms
show that the sum of its first (m+n) terms is zero