CBSE Class 11-science Answered
I have four currency notes valued at Rs 50,100 and 2 notes of 500.In how many ways can I select the
currency note ,so that only one type of note is selected each time?
We have 3 notes here, 50, 100 and 500.
So I can pick a 50 Rupee note, 100 Rupee note and a 500 Rupee note.
So I have 3 selections here.
I can also pick all three at the same time. (50,100,500)
This would count as one selection.
I can also choose two at a time
Hence, I can take either a 50 and a 100 rupee note, a 100 and a 500 rupee note, and a 50 and a 500 rupee note. Hence, there are 3 more cases here.
Total number of possible selections â€“3+3+1=7