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सिद्ध किजिये कि 7 ^(2n )+2 ^(3n -3 )। ...

सिद्ध किजिये कि `7 ^(2n )+2 ^(3n -3 )। 3 ^(n -1 )` प्रत्येक प्राकृतिक संख्या n के लिये 25 से विभाज्य है ।

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