Practice Test




Correct option is A

Explanation :
111....1(91 times) =1+10+102+.... +1090=1091-110-1=(107)13-110-1=t13-19, where t=107=(t-19)(t12+t11+.......+t+1)=(107-110-1)(1+t+t2+....+t12)=(1+10+102+....+106)(1+t+t2+......t12)∴ 111....1(91 times ) is a composite number
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