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22 Sep 2007, 09:25
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A credit card number has 5 digits (between 1 to 9). The first two digits are 12 in that order, the third digit is bigger than 6, the forth is divisible by 3 and the fifth digit is 3 times the sixth. How many different credit card numbers exist?
a) 27.
b) 36.
c) 72.
d) 112.
e) 422.
a) 27.
b) 36.
c) 72.
d) 112.
e) 422.
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22 Sep 2007, 09:29
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IrinaOK
Please check the question - "3 times the SIXTH" doesn't make sense if there are only 5 digits in all.
22 Sep 2007, 11:51
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I get A 27
we have 1 option for the first two digits.
789 for the second so 3
963 for the fourth 3
and when sixth is 1 fifth is 3, when sixth is 2 fifth is 6 and when sixth is 3 fifth is 9, (these are all of the options that fit the restrictions)
so it is 1*3*3*3
27
we have 1 option for the first two digits.
789 for the second so 3
963 for the fourth 3
and when sixth is 1 fifth is 3, when sixth is 2 fifth is 6 and when sixth is 3 fifth is 9, (these are all of the options that fit the restrictions)
so it is 1*3*3*3
27
