four letter words that end in r

How many different 4-letter non-meaningful words can be formed by using the letters R, E, A and D, if each letter is used only once? => 24 or 3 or 21 or 16..

An assignment required six students to write as many words as they can starting with the letter R. The number of words written by each of them were in the line plot. Find the ratio of the number of words written by Suzane to that by Caroll. => 1 : 1..

How many different 4-letter permutations can be formed from the letters in the word 'united'? => 720 or 360 or 15 or 24..

What is the distance between the letters Q and R? => 3 units or 1 unit or 4 units or 2 units..

. They all sat and related incidents of other mad men who had stranger habits and laughed at their own experiences with mad men. For several days after that, Ali did not go to the post-office. No one had sympathy or understanding to guess what the reason could be, but they were all curious to know ..

What fraction of the letters in the word MISSISSIPPI is I's? => 4 11 or 3 4 or 3 10 or 3 11..

One letter is chosen at random from the word "MISSISSIPPI". What is the probability of choosing the letter S? => 2 11 or 3 11 or 1 11 or 4 11..

Identify the letter to the left of R in the word LETTER . => L or T or E or R..

How many 4 letter permutations can be made from the set {S, Q, U, A, R, E} so that they all start with the letter S, and repetition of a letter is not allowed? => 60 or 20 or 720 or 90..

State whether the arrangement of 3-lettered words from the alphabets C, H, E, M, I, S, T, R, Y is a permutation or a combination. => Permutation or Combination..