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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

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