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How many 4 digit numbers begin with a digit that is prime

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How many 4 digit numbers begin with a digit that is prime [#permalink] New post 07 Sep 2004, 17:27
How many 4 digit numbers begin with a digit that is prime and end with a digit that is prime ?

(A) 16
(B) 80
(C) 800
(D) 1440
(E) 1600
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 [#permalink] New post 07 Sep 2004, 19:37
Leading prime: 4 possibilities (2,3,5,7)
Ending prime: 4 possibilities (2,3,5,7)
2nd digit: any of the 10 numbers
3rd digit: any of the 10 numbers

Total possibilities = 4 * 10 * 10 * 4 = 1,600. E.
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 [#permalink] New post 07 Sep 2004, 19:40
Agree with E :)
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Paul

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 [#permalink] New post 07 Sep 2004, 22:49
:done

OA is E

You guys are good...Paul you need to speed up... :-D
I must admit Intr3pid is fast :moped
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 [#permalink] New post 07 Sep 2004, 23:34
i agree i am late
but
answer E
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  [#permalink] 07 Sep 2004, 23:34
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