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

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VP
VP
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Joined: 13 Jun 2004
Posts: 1119
Location: London, UK
Schools: Tuck'08
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How many 4 digit numbers begin with a digit that is prime [#permalink] New post 07 Sep 2004, 16:27
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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
Manager
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Joined: 05 Sep 2004
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 [#permalink] New post 07 Sep 2004, 18:37
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, 18:40
Agree with E :)
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Best Regards,

Paul

VP
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Joined: 13 Jun 2004
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 [#permalink] New post 07 Sep 2004, 21:49
: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, 22:34
i agree i am late
but
answer E
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Jim

  [#permalink] 07 Sep 2004, 22:34
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How many 4 digit numbers begin with a digit that is prime

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