? A boy want to buy 4 books and 6 pens . how many ways he can buy them How many different 2-letter permutations can be formed from the letters in the word "'"decagon How many different 6-letter words, obtained by rearranging the letters of voLume ? Let P(A)=0.51 and P(B)=0.29 and P(A or B)=0.55, find the value of P(A and B). a 1 Let P(A)=0.18 and P(B)=0.72 let A and B are mutually exclusive. Find the value of P(A or B)