SAT I 每日一問:2012年8月23日
作者:滬江英語
來源:CollegeBoard
2012-08-23 13:00
The Correct answer is A.
Explanation
The correct answer is(A). If the tens digit is.?If the tens digit is??there are??positive two-digit integers with the ones digit greater than twice the tens digit:?andIf the tens digit is?there arepositive two-digit integers with the ones digit greater than twice the tens digit:?and.?If the tens digit is?,?there is?positive two-digit integer with the ones digit greater than twice the tens digit:;If the tens digit is equal to or greater than?then the ones digits, which cannot be greater than?is not greater than twice the tens digit. Therefore, there is a total of?positive two-digit integers for which the ones digit is greater than twice the tens digit.