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wiseguy
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If the first digit cannot be a 0 or 5 how many five-digit 23 Nov 2004, 10:46
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If the first digit cannot be a 0 or 5 how many five-digit odd numbers are there.

A. 42,500
B. 37,500
C. 45,000
D. 40,000
E. 50,000



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If the first digit cannot be a 0 or 5 how many five-digit 23 Nov 2004, 13:11
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D) 40,000

8 possible numbers for 1st digit, 10 possible numbers for 2nd, 3rd and 4th and 5 possible numbers for 5th digit.

Ans =8*10*10*10*5 = 40,000
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If the first digit cannot be a 0 or 5 how many five-digit 23 Nov 2004, 14:50
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Perfect answer.

D it is.
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wiseguy
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If the first digit cannot be a 0 or 5 how many five-digit 24 Nov 2004, 14:47
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why 5 possible number for the 5th digit.
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gayathri
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If the first digit cannot be a 0 or 5 how many five-digit 24 Nov 2004, 14:50
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wiseguy
why 5 possible number for the 5th digit.
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It asks for odd numbers and that is possible only with [1,3,5,7,9]. hence 5 possible numbers for the 5th digit.
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If the first digit cannot be a 0 or 5 how many five-digit 24 Nov 2004, 17:09
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I'm a little confused. Why 8 possible numbers for the first digit? And is the OA 40, 000?
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If the first digit cannot be a 0 or 5 how many five-digit 24 Nov 2004, 18:04
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Seyi
I'm a little confused. Why 8 possible numbers for the first digit? And is the OA 40, 000?
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Seyi, I said 8 possible numbers because in a set of [0,1,2,...,9] there are 10 numbers but the question stem said that the first digit cannot be 0 or 5, which leaves 8 possible choices for the first digit.



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