Question

Which are the most frequently found letters in the English language ?

(a) e,a

(b) e,o

(c) e,t

(d) e,i

This question was posed to me during an interview.

The question is from Substitution and Transposition Techniques in section Classical Encryption Techniques of Cryptograph & Network Security

Answer 1

Right answer is (c) e,t

To explain I would say: The relativity frequency of these letters in percent : e-12.702, a-8.167, t-9.056, i-6.996, o-7.507.