How many 4 digit numbers begin with a digit that is prime : Quant Question Archive [LOCKED]
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# How many 4 digit numbers begin with a digit that is prime

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VP
Joined: 13 Jun 2004
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Location: London, UK
Schools: Tuck'08
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How many 4 digit numbers begin with a digit that is prime [#permalink]

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07 Sep 2004, 16:27
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
Manager
Joined: 05 Sep 2004
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07 Sep 2004, 18:37
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.
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07 Sep 2004, 18:40
Agree with E
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Best Regards,

Paul

VP
Joined: 13 Jun 2004
Posts: 1118
Location: London, UK
Schools: Tuck'08
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07 Sep 2004, 21:49

OA is E

You guys are good...Paul you need to speed up...
I must admit Intr3pid is fast
Manager
Joined: 28 Jul 2004
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07 Sep 2004, 22:34
i agree i am late
but
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Jim

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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