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Alan has forgotten his 4-digit PIN code. He knows the second digit is 3, and the 4 digits make a number divisible by 5. How many different sets of 4 digits could it be?
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Jun 24, 2022
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Alan has forgotten his 4-digit PIN code.
He knows the second digit is 3, and the 4 digits make a number divisible by 5.
How many different sets of 4 digits could it be?
Mathematics
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IAviator
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The answer Probably 200
Joe Skora
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Jun 26, 2022
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Joe Skora
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200
If the number is divisible by 5, then the last digit should be either 5 or 0.
First digit is fixed.
Second digit can be 10 ways.
Third digit can be 10 ways.
Fourth digit can be 2 ways.
So total number of digits 1 x 10 x 10 x 2 = 200
Ryan Huang
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Jun 29, 2022
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Ryan Huang
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