1.

The number of ways of seven digit number with distinct digits of the form `a_(1)a_(2)a_(3)a_(4)a_(5)a_(6)a_(7),(a_9(i)!=0AAi=1,2,.7)` be present in decimal system such that `a_(1)lta_(2)lta_(3)lta_(4)gta_(5)gta_(6)gta_(7)`A. `820`B. `720`C. `620`D. `120`

Answer» Correct Answer - B
`.^(6)C_(3).^(3)C_(3)+^(7)C_(3).^(4)C_(3)+^(8)C_(3).^(5)C_(3)=720`


Discussion

No Comment Found

Related InterviewSolutions