Question

student=2356719 then,
Ten=?​

Answer 1

Answer:

If the student answers 3 questions from the first five questions then he can choose 7 questions from the remaining 8 questions. Therefore number of combinations will be

=

5

C

3

×

8

C

7

=10×8

=80

If the student answers 4 questions from the first five questions he can choose 6 questions from the remaining 8 questions. Which will be

=

5

C

4

×

8

C

6

=5×28

=140

If the student answers 5 questions from the first five questions he can choose 5 questions from the remaining 8 questions. Which will be

=

5

C

5

×

8

C

5

=1×56

=56

Therefore, the total number of choices =80+140+56=276

Hence, this is the answer.