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How many 4-digit numbers have the following two properties? The first
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14 Oct 2021, 09:29
14 Oct 2021, 09:29
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Question Stats:
87% (01:40) correct
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How many 4-digit numbers have the following two properties? The first and last digits of the number are both prime numbers, and the number is divisible by 2 or 5.
800
900
1,000
1,200
1,600
800
900
1,000
1,200
1,600
Re: How many 4-digit numbers have the following two properties? The first
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14 Oct 2021, 10:31
14 Oct 2021, 10:31
1
Carcass wrote:
How many 4-digit numbers have the following two properties? The first and last digits of the number are both prime numbers, and the number is divisible by 2 or 5.
800
900
1,000
1,200
1,600
800
900
1,000
1,200
1,600
Based on the conditions, first digit can be {2,3,5,7} and last digit can be {2,5} and 2nd and 3rd digit can be any of the 10.
so 4 * 10 * 10 * 2 = 800
Answer is A)
gmatclubot
Re: How many 4-digit numbers have the following two properties? The first [#permalink]
14 Oct 2021, 10:31
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