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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
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Location: London, UK
Schools: Tuck'08
How many 4 digit numbers begin with a digit that is prime [#permalink]

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New post 07 Sep 2004, 17:27
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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Manager
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Joined: 05 Sep 2004
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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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New post 07 Sep 2004, 19:40
Agree with E :)
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Best Regards,

Paul

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VP
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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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New post 07 Sep 2004, 23:34
i agree i am late
but
answer E
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Jim

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  [#permalink] 07 Sep 2004, 23:34
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