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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
Posts: 1123
Location: London, UK
Schools: Tuck'08
Followers: 7

Kudos [?]: 31 [0], given: 0

How many 4 digit numbers begin with a digit that is prime [#permalink]  07 Sep 2004, 16:27
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
Manager
Joined: 05 Sep 2004
Posts: 97
Followers: 1

Kudos [?]: 3 [0], given: 0

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.
GMAT Club Legend
Joined: 15 Dec 2003
Posts: 4313
Followers: 26

Kudos [?]: 216 [0], given: 0

Agree with E
_________________

Best Regards,

Paul

VP
Joined: 13 Jun 2004
Posts: 1123
Location: London, UK
Schools: Tuck'08
Followers: 7

Kudos [?]: 31 [0], given: 0

OA is E

You guys are good...Paul you need to speed up...
I must admit Intr3pid is fast
Manager
Joined: 28 Jul 2004
Posts: 54
Followers: 1

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

i agree i am late
but
_________________

Jim

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