please answer the following systematically, show the complete solution

3. If a letter is chosen at random from the English alphabet, find the probability that the letter a) Is a vowel exclusive of v b) Precedes the letter j c) Follows the letter g 4. If a permutation of the word "white" is selected at random, find the probability that the permutation a) Begins with a consonant b) Ends with a vowel c) Has the consonants and vowels alternating