Question

Four alphabets E, K, S and V, one in each, were purchased from a plastic warehouse. How many ordered pairs of alphabets, to be used as initials, can be formed from them?

Answer 1

Total number of letters $=4$

Number of ordered pairs of letters that can be formed like (E, K) or (S, E) etc = ${4_P}_2=\frac{4!}{2!}=\frac{24}{2}=12$