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Re: DS - Number theory [#permalink]
03 May 2006, 20:00
gmat_crack wrote:
An integer greater than 1 that is not a prime is called composite. If the two digit integer n is greater than 20, is n composite ?
1. The tenths digit of n is a factor of the unit digits of n 2. The tenths digit of n is 2
I've a confusion, whether "tenths" and tens" digit is are same
'tenths' digit is the first digit after the decimal point (right of decimal point)
'tens' digit is the second digit before the decimal point (left of the decimal pont) 24, in this case 2 is the tens digit. hope this helps.
Re: DS - Number theory [#permalink]
03 May 2006, 20:04
shampoo wrote:
gmat_crack wrote:
An integer greater than 1 that is not a prime is called composite. If the two digit integer n is greater than 20, is n composite ?
1. The tenths digit of n is a factor of the unit digits of n 2. The tenths digit of n is 2
I've a confusion, whether "tenths" and tens" digit is are same
'tenths' digit is the first digit after the decimal point (right of decimal point) 'tens' digit is the second digit before the decimal point (left of the decimal pont) 24, in this case 2 is the tens digit. hope this helps.
Note: the above is a general rule, however, in this problem it seems that tenths refers to tens. someone correct me if I am wrong. thanks