दर्शाइए कि n2-1, 8 से विभाज्य होता है जबकि n एक धनात्मक विषम पूर्णांक हो।
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655566656/*666//'/666655
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n²-1 , 8 से विभाज्य होता है यदि n एक धनात्मक विषम पूर्णांक है
Step-by-step explanation:
n एक धनात्मक विषम पूर्णांक है
n = 2k + 1
n² - 1
= (2k + 1)² - 1
= 4k² + 1 + 4k - 1
= 4k² + 4k
= 4k(k + 1)
स्थिति 1 : k = 2m
= 4 (2m)(2m + 1)
= 8m(2m + 1)
8 से विभाज्य है
स्थिति 2 : k = 2m + 1
= 4 (2m + 1)(2m + 1 + 1)
= 4(2m + 1)(2m + 2)
= 4(2m + 1)2(m + 1)
= 8(2m + 1)(m + 1)
8 से विभाज्य है
इति सिद्धम
n²-1 , 8 से विभाज्य होता है यदि n एक धनात्मक विषम पूर्णांक है
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