plzzz tell fast for tomorrow's boards
There are only 4 ways, because one envelope corresponds to one letter.
But for any one letter selected there are 4 envelopes available, so we put it in any one.
For second letter now there are 3 envelopes available,
For third only two are available.
Total number of ways = 4x3x2 = 24
The same way of saying it is, 4!.
I just opened Topperleaing.com and saw the Solved Boards paper for Maths Class X. I opened it and noticed that in the question regarding probability........where cards are numbered 1,3,5....35, in this question's second part, whe