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

Author Message
VP
Joined: 13 Jun 2004
Posts: 1111

Kudos [?]: 51 [0], given: 0

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

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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

Kudos [?]: 51 [0], given: 0

Manager
Joined: 05 Sep 2004
Posts: 97

Kudos [?]: 5 [0], given: 0

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07 Sep 2004, 19:37
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.

Kudos [?]: 5 [0], given: 0

GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4284

Kudos [?]: 536 [0], given: 0

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07 Sep 2004, 19:40
Agree with E
_________________

Best Regards,

Paul

Kudos [?]: 536 [0], given: 0

VP
Joined: 13 Jun 2004
Posts: 1111

Kudos [?]: 51 [0], given: 0

Location: London, UK
Schools: Tuck'08

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07 Sep 2004, 22:49

OA is E

You guys are good...Paul you need to speed up...
I must admit Intr3pid is fast

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Manager
Joined: 28 Jul 2004
Posts: 54

Kudos [?]: 1 [0], given: 0

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07 Sep 2004, 23:34
i agree i am late
but
_________________

Jim

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07 Sep 2004, 23:34
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# How many 4 digit numbers begin with a digit that is prime

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