The number 1111.....1(91 times) is a
A) prime b) non prime c) even
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b is the right answer
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111...111(91times) can be expressed as:-
⟹19×(1091−1)⟹19×(1091−1)
⟹19(107−1)×x=1111111×x⟹19(107−1)×x=1111111×x
where x=(107)12+(107)11+⋯+1
So it's not a prime no.
⟹19×(1091−1)⟹19×(1091−1)
⟹19(107−1)×x=1111111×x⟹19(107−1)×x=1111111×x
where x=(107)12+(107)11+⋯+1
So it's not a prime no.
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