Two letters from the word KHANTKAR are selected at random. What is the probability that at least one of the selected letters is a consonant?
Choose the correct option: A) 25 / 28 B) 27 / 28 C) 30 / 28 D) 40 / 28 E) 50 / 28

Rationale: there are 6 consonants and 2 vowels in khantkar . probability that at least one of the selected letters is a consonant = 1 - ( probability of both vowels ) probability of both vowels = 2 c 2 / 8 c 2 = 1 / 28 so , answer is 1 - 1 / 28 = 27 / 28 answer : b
Answer: B