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Alan has forgotten his 4-digit PIN code. He knows the first digit is 3, and last digit is larger than 3. How many different sets of 4 digits could it be?
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Nov 28, 2022
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Alan has forgotten his 4-digit PIN code.
He knows the first digit is 3, and last digit is larger than 3.
How many different sets of 4 digits could it be?
Mathematics
high-school
Kyle Hughes
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Kyle Hughes
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the first number obviously is 3 and the next number has to be bigger so its 6 .
Jessa
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Nov 29, 2022
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Jessa
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If Alan knows one already, there is 3 more left for him to possibly know
Nighliber
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Dec 2, 2022
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Nighliber
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