# Combinatories - Combinatories MCQ

6:

The number of way a person roundtrip by bus  from A to C by way of B will be

 A. 12 B. 48 C. 144 D. 264 Answer Report Discuss Option: C Explanation : There are twelve ways to go from A to C by way of B, and 12 ways to return. Hence there are 12 x 12 = 144 ways to travel round trip. Click on Discuss to view users comments. Write your comments here:
7:

The number of diagonals that can be drawn by joining the vertices of an octagon is

 A. 28 B. 48 C. 20 D. None of these Answer Report Discuss Option: C Explanation : Click on Discuss to view users comments. Write your comments here:
8:

The number of ways in which a team of eleven players can be selected from 22 players including 2 of them and excluding 4 of them is

 A. 16C11 B. 16C5 C. 16C9 D. 20C9 Answer Report Discuss Option: C Explanation : Click on Discuss to view users comments. Write your comments here:
9:

How many 10 digits numbers can be written by using the digits 1 and 2 ?

 A. 10C1+9C2 B. 210 C. 10C2 D. 10 ! Answer Report Discuss Option: B Explanation : Click on Discuss to view users comments. Write your comments here:
10:

In an examination there are three multiple choice questions and each question has 4 choices. Number of ways in which a student can fail to get all answers correct is

 A. 11 B. 12 C. 27 D. 63 Answer Report Discuss Option: D Explanation : Click on Discuss to view users comments. Aditya said: (1:50am on Tuesday 29th January 2013) No.of ways of attempting 1st,2nd,3rd questions are each.Total no.of ways=4.4.4=64No.of ways to getting all correct answers=1.1.1=1therefore,No.of ways of not getting all answers correct=64-1=63 Write your comments here: