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2014-07-12T15:00:22+05:30

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7¹ = 7
7² = 49
7³ = 343
7⁴ = 2401
7⁵ = 16801
so 7²⁹¹
so 291 is divisible by 3 i.e. 3 x 97
so from above we get the unit digit is 3

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hope it helps
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