Sonia wants to write a positive five-digit integer whose digits are 1, 2, 3, 4 and 5 in some order.
The first digit of the integer is to be divisible by 1, the first two digits are to form a two-digit integer divisible by 2, the first three digits are to form a three-digit integer divisible by 3, the first four digits are to form a four-digit integer divisible by 4 and the five-digit integer itself is to be divisible by 5.
How many such five-digit integers could Sonia write?
Select one option, then click Submit.
1 : 1
2 : 3
3 : 5
4 : 7
5 : 9
Select an option, then submit.
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Junior Kangaroo 2021 (2021)
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