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Evaluate this remainder (Posted on 2008-08-13) Difficulty: 2 of 5
What is the remainder when you divide 299 by 99?

See The Solution Submitted by pcbouhid    
Rating: 4.0000 (1 votes)

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Solution Alternative Methodology | Comment 4 of 6 |
(In reply to Solution by K Sengupta)


Alternatively, expanding by Binomial Theorem, we have:

2^95
= (33-1)^19
= (33^19 – comb(19, 1)*33^18 +......- comb(19,17)*33^2 +  comb(19,18)*33 – 1)
= M(99) + 19*33 -1,
= M(99) +  18*33 + (33-1)
= M(99) + 32

Accordingly,

2^95 (mod 99) = 32, so that:
2^99 (mod 99) = (32*16) mod 99

But, 32*16
= (33-1)(15+1)
 = 33*15 +(33-15-1)
= M(99) + 17, since 15 is divisible by 3, so that 33*15 is divisible by 99

Accordingly, 
2^99 (mod 99) = 17

Consequently, the required remainder is 17.


  Posted by K Sengupta on 2008-08-13 11:38:11
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