First slide

Combinations

Question

In an examination, a student has to answer 4 questions out of 5 questions; questions 1 and 2 are however compulsory. Find the number of ways in which the student can make the choice.

Moderate

A

3
B

2
C

4
D

5

Solution

Since, questions 1 and 2 are compulsory, Bo students has to select two question in out of three questions.
.'.Required number of ways $=^{3} C_{2} = 3$

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