Mathematics, 15.04.2020 20:15 nikkierubio2007

Find how many six-digit numbers can be formed from the digits 2, 3, 4, 5, 6 and 7 (with repetitions), if:
the numbers formed must be divisible by 25
or
the odd digits must occupy even positions (i. e. 2nd, 4th, and 6th) and the even digits must occupy odd positions (i. e. 1st, 3rd and 5th)

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Find how many six-digit numbers can be formed from the digits 2, 3, 4, 5, 6 and 7 (with repetitions)...