HANS WOYDA MATHEMATICS QUIZ COMPETITION 1999/2000

Time: 60 seconds. All questions are to be done mentally. A PIN number is a four digit number which may start with one or more zeros and may include repeated digits. Year. 7-9 1) Find how many possible PIN numbers there are. 2) Find how many PIN numbers are multiples of 4. 10-11 3) Find how many PIN numbers there are in which each digit is prime. ................
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