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गणितीय आगमन सिद्धांत द्वारा सिद्ध क...

गणितीय आगमन सिद्धांत द्वारा सिद्ध कीजिए कि `3 .6 +6 .5 +9 .12 +…….. +3 n (3n +3 )=3n (n +1 )(n +2 ).`

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3.6+6.9+9.12+....+3n(3n+3)=

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