How many three-lettered words can be formed such that at least one symmetrical letter is there?
Explanation:
Number of asymmetrical letters = 15
Total number possible of words = 26 × 26 × 26 = 17576
Number of words without any symmetrical letters = 15 × 15 × 15 = 3375
Number of words with at least one symmetrical letter = 17576 − 3375 = 14201
Hence, option (d).
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