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How many 3-digit numerals ?

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How many 3-digit numerals ? [#permalink] New post 10 Jul 2011, 20:40
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Question Stats:

75% (01:26) correct 25% (00:00) wrong based on 4 sessions
How many 3-digit numerals begin with a digit that represents a prime and end with a digit that represents a prime number?

A) 16
B) 80
c) 160
D) 180
E) 240
[Reveal] Spoiler: OA
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Re: How many 3-digit numerals ? [#permalink] New post 10 Jul 2011, 21:07
prime digits - 2, 3, 5, 7

there will 10 number starting with 2 and ending in 2 like 202, 212, 222, 232..
similarly 10 numbers starting with 2 and ending in 3, 10 ending in 5, and 10 ending in 7
so total numbers starting with 2 = 40
similarly 40 starting with 3, 5, and 7
so total = 40*4 = 160
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Re: How many 3-digit numerals ? [#permalink] New post 11 Jul 2011, 00:04
prime digits 2,3,5 and 7.
three digit numbers _ _ _
1st place can be filled in 4 ways
2nd place can be filled in 10 ways
3rd place can be filled in 4 ways
Total=4*10*4=160
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Re: How many 3-digit numerals ?   [#permalink] 11 Jul 2011, 00:04
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