Counting methods question How many 4 digit positive integers can be formed without using either '3' or '5'?a. 3584b. 5416c. 6416d. 4096e. 4904Correct Answer : Choice A. 3584Explanatory AnswerWe can count the number of such numbers if we can determine the options available for each of the four digits of the 4-digit number starting with the left most (thousands place).The left … [Read more...] about SAT Counting Methods : Numbers
SAT Number Properties
Number Properties : Divisibility
This question tests your understanding of divisibility.Question If K is divisible by 3, 4 and 5, which of the following will also divide K? I. 3, 4 and 15 II. 12, 15 and 18 III. 5, 20 and 30 A. I only B. II only C. I and II only D. I and III only E. II and III onlyCorrect Answer : Choice D. I and III only.Explanatory AnswerIf K is divisible by 3, 4 and 5, K has to be a … [Read more...] about Number Properties : Divisibility