Third digits of the combination can be the same

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Ron just bought a new combination lock. The combination to the lock requires 4 numbers, each column contains the numbers 0 to 6.

a. How many combinations are possible if all 4 digits of the combinations must be different?

b. How many of the possible combinations, found in part a), contain a 3.

c. How many additional possibilities are there if the second and third digits of the combination can be the same?

Reference no: EM132227897

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