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यदि a1, a2, a3,........, an समांतर श्रे...

यदि `a_1, a_2, a_3,........, a_n` समांतर श्रेणी में हो, तो दर्शाइए की
`1/(a_1 a_n) + 1/ (a_2 a_(n-1))+.........+ 1/(a_n a_1) = 2/(a_1 + a_n) (1/a_1 + 1/a_2 +.......+ 1/a_n)`

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