Steps
1. Jan preparing an examination for students
2. Each student will have questions with no student having duplicate question
3. Total no of questions Jan need to prepare is
4. We should multiply one digit at a time,
5. Multiply
6. Multiply, remember to place as a place holder
(carry to the next number)
(add carry to )
Then ,
7. Now add two products then
Hence, the number of questions Jan need to prepare for examination is.