How many 7 letter words neither starting with O nor ending with Y can be formed?
Explanation:
Total number of words = 7! = 5040. (From 1st question)
Number of words starting with O or ending with Y = 1320 (From previous question)
∴ Number of words neither starting with O or ending with Y = 5040 – 1320 = 3720.
Hence, 3720.
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