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How many possible 4-digit numbers can be created where the thousands
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Bunuel
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How many possible 4-digit numbers can be created where the thousands [#permalink] New post  28 Dec 2016, 00:49
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How many possible 4-digit numbers can be created where the thousands digit and the tens digit are both prime and the number is divisible by 5?

A. 10,000
B. 800
C. 320
D. 160
E. 32
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vivekkumar987
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Re: How many possible 4-digit numbers can be created where the thousands [#permalink] New post  28 Dec 2016, 01:01
Bunuel wrote:
How many possible 4-digit numbers can be created where the thousands digit and the tens digit are both prime and the number is divisible by 5?

A. 10,000
B. 800
C. 320
D. 160
E. 32



Four digit so : -- -- -- --

First one prime number so : 2 3 5 7 : 4 chance
Second number : 0-9 : 10 chnace
Third number : 2 3 5 7 : 4 chance
fourth number : 0 or 5 : 2 chance

so 4*10*4*2 = 320
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Re: How many possible 4-digit numbers can be created where the thousands [#permalink]
28 Dec 2016, 01:01
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