" 12.यदि Any स.श्रे.का "m" 5th term "(1)...

" 12.यदि Any स.श्रे.का "m" 5th term "(1)/(n)" And "n" 5th term "(1)/(m)" हो,तो Prove that "mn" Sum of steps "(1)/(2)(mn+1)" Will happen. "

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