#30 Sticking in a PIN
Sachin tells me that the four-digit PIN that he uses for his credit card has an unusual property. When he enters his PIN into a calculator and squares it, the last four digits of the answer are also his PIN. He tells me that exactly one of the digits in his PIN is a zero, but he won’t tell me which position it is in.
What is Sachin’s PIN?
Answer next week
#29 How many strips?
It is possible to make 15 strips.
To see …
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