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50 - Digit Number (Posted on 2003-11-15) Difficulty: 3 of 5
A number of 50 digits has all its digits equal to 1 except the 26th digit. If the number is divisible by 13, then find the digit in the 26th place.

See The Solution Submitted by Ravi Raja    
Rating: 3.3333 (6 votes)

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Hints/Tips re(2): Re so easy SECOND OPINION att :NK | Comment 37 of 39 |
(In reply to re: Re so easy by NK)

NK,
Take a number, say 652 . When you say its first digit is 6 second is 5 etc you count from left to right.
That's the way I did it. ( i did it my way..)
Of course you are free to define it the other way
and then X1=91 ===> X=9 .

So you and I solved two problems for the price of one.

enjoy, enjoy

ady
  Posted by Ady TZIDON on 2004-02-11 07:24:20

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