ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!

    Question

    How many integers between 100 and 999 have all digits

    distinct?
    A 582 Correct Answer Incorrect Answer
    B 770 Correct Answer Incorrect Answer
    C 648 Correct Answer Incorrect Answer
    D 620 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Hundreds digit: 1тАУ9 тЖТ 9 choices Tens digit: any except chosen hundreds тЖТ 9 choices Units digit: any except previous two тЖТ 8 choices Total = 9 ├Ч 9 ├Ч 8 = 648

    Practice Next
    More No. System Questions
    ask-question