Before being simplified, the instructions for computing income tax in Country R were to add 2 percent of one's annual income to the average (arithmetic mean) of 100 units of Country R's currency and 1 percent of one's annual income. Which of the following represents the simplified formula for computing the income tax, in Country R's currency, for a person in that country whose annual income is I ?
This is akin to do the following: 1) put one letter into its corresponding evelope. 2) put the othe three letters into evelopes. Total possibilites are 6: 1 2 3 A B C A C B B A C B C A C A B C B A 3) caculate what is the probability that all the othe three letters are in wrong evelopes. Only C A B; B C A fulfil this requirement assuming A, B, C matches with 1, 2,3, respectively.
Tanya prepared 4 different letters to be sent to 4 different addresses. For each letter, she prepared an envelope with its correct address. If the 4 letters are to be put into the 4 envelopes at random, what is the probability that only 1 letter will be put into the envelope with its correct address?