Posted by jenny on Wednesday, July 25, 2012 at 6:44pm.
how many 7 digit telephone numbers can be made if every other digit is even

math  Reiny, Wednesday, July 25, 2012 at 9:29pm
Not sure if the 7 digit can start with a zero, looked at my phone book and couldn't find any
could be
EOEOEOEOE , assuming the 0 with the evens
number = 4x5x5x5x5x5x5 = 4x5^6 = 62500
or could be
OEOEOEO
number = 5^7 = 78125
for a total of 140625
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