amaanuddin22010639 amaanuddin22010639

28-01-2021
Mathematics

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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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brainboy14 brainboy14

28-01-2021

If Alan knows one already, there is 3 more left for him to possibly know

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lyric7963 lyric7963

28-01-2021

the first number obviously is 3 and the next number has to be bigger so its 6 .

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