SOLUTION: Determine the number of possible 7-digit telephone Nos. if none f the first three digits (from left) can equal to zero and: (Solve each part separately) [4-Marks] a) Any digits c

Question 1172340: Determine the number of possible 7-digit telephone Nos. if none f the first three digits
(from left) can equal to zero and: (Solve each part separately) [4-Marks]
a) Any digits can be used for the remaining numbers.
b) The first digit must be odd, alternating thereafter between even and odd digits.
c) All digits must be even.
d) No digits can be repeated
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
This is 9*9*9*10000
-
9*9*9*5*5*5*5
-
9*9*9*5*5*5*5
-
9*9*9*10*9*8*7.
(assuming for the last three problems that the restrictions apply only to the last four digits, otherwise the answers are very different.)
RELATED QUESTIONS
I can only remember a seven-digit telephone number if the first three digits (the... (answered by CPhill,ikleyn)

How many 7-digit telephone numbers are possible if the first digit cannot be zero and... (answered by Alan3354)

How many diffeent 7 digits telephone numbers are possible if the first digit cannot be... (answered by stanbon)

I saw this solution online from a tutor (ikelyn). I think there's a mistake in it and i... (answered by math_tutor2020,ikleyn)

Consider any positive three-digit integer that has all of its digits distinct and none... (answered by ankor@dixie-net.com)

In a small city there are different exchanges possible for each 7-digit telephone number. (answered by josmiceli)

a license plate is to consist of three digits followed by two uppercase letters.... (answered by stanbon)

how many 7-digit telephone numbers are possible if the first digit cannot be zero and (answered by Edwin McCravy)

How many seven-digit telephone number can be formed if the first three digits cannot be... (answered by stanbon)