Repetition 80362

How many six-digit numbers without repetition can be formed from the digits 1, 2, 3, 4, 5, and 6, if the numbers are, to begin with: a) the digit 4; b) digits 4 or 5?

Correct answer:

a =  120
b =  240

Step-by-step explanation:

a=1 5 4 3 2 1=120
b=2 5 4 3 2 1=240



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