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Guess the pincode

(3 votes, average: 1.33 out of 5)

June 24, 2013 by puzzler 3 Comments

A person forgot his 5 digit pin code, but he remembers some hints.

  1. 1st digit is square of 2nd digit.
  2. Sum of 2nd and 3rd digit makes 10.
  3. 4th digit is 2nd digit+1.
  4. Sum of 5th and 3rd digit makes 14.
  5. Sum of all 5 digits = 30

Can you guess the person’s pin code from above hints ?


See AnswerHide Answer
Pin code is 93747.
How?
Lets assume second digit is x, then first digit should be x^2 and fourth digit should be x+1.

also assume, 3rd digit is y then 5th digit should be 14-y.
So the number will look like this:-
<x^2><x><y><x+1><14-y>

As we also know the sum of all digits, we can say

x^2 + 2x +1 +14 = 30
(x+1)^2 = 16
x+1 = 4
x = 3

As sum of 2nd and third digit is 10 => x+y = 10 => y=7
Thus the pin code is 93747.

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Comments

  1. fivebee says

    February 2, 2014 at 5:42 pm

    My pin code is used to be 10032

    Reply
    • Yuvaraj Sv says

      October 2, 2014 at 12:38 pm

      93747

      Reply
      • Nuela says

        July 28, 2016 at 1:43 pm

        you must have known the first digit!

        Reply

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