In how many ways can four letters of the word ‘SERIES’ be arranged?
Explanation:
The words SERIES has one R, one I, two Es and two Ss.
Four letters can be selected and arranged in the following ways:
∴ Total number of arrangements = 6 + 12 + 12 + 12 + 12 + 12 + 12 + 24 = 102
Hence, option (d).