Answer :

Given: the total number of letters = 4


To find: Number of ordered pairs of letters that can be formed like (E, K) or (S, E) etc.


Formula used:


Number of arrangements of n things taken r at a time = P(n, r)



The total number of ways in which this can be done


= the number of arrangements of 4 things taken 2 at a time


= P(4, 2)





= 4 × 3


= 12


Hence, Number of ways in which ordered pairs of letters, to be used as initials, can be formed from given 4 letters are 12


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