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Saket Jha

· started a discussion

· 1 Months ago

Absurd solution (Question: 109778.0 )

shekhar is right 9999999999999................(20 times) will be divisible by 9, bt 27=9*3 as if we devide 9999999999999................(20 times) by 9 we will get 1111111111111111111............(20 times) which will be not divisible by further 3.

Question:
(1021-1) is not divisible by:
Options:
A) 3
B) 9
C) 11
D) 27 
Solution:
Ans:(c) We know that (xn - 1) is not divisible by (x+1) for odd values  of n.

\(\therefore\) (1021 - 1) is not divisible by (10+1 = 11) since 21 is on odd number

Saket Jha

· commented

· 1 Months ago

oh....actually it will be 21 times 9......sorry
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