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यदि x, y, z समान्तर श्रेणी में हैं तो सिद्ध कीजिए कि (x + 2y – z)(2y + z – x) (z + x – y) = 4xyz

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∵ x, y व z समान्तर श्रेणी में है।

∴ 2y = x + z

सिद्ध करना हैं (x + 2y – z)(2y + z – x)(z + x – y) = 4xyz

L. H. S. = (x + 2y – z)(2y + z – x)(z + x – y)

∵ 2y = x + z

∴ (x + x + z – z)(x + z + z – x) (2y – y)

= (2x)(2z)(y)

= 4xyz = R.H.S

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