How many 7 letter words starting with O or ending with Y can be formed?
Explanation:
Number of words starting with O or ending with Y = O + Y – O ∩ Y.
O = Number of words starting with O = 720.
Y = Number of words ending with Y = 720.
O ∩ Y = Number of words starting with O & ending with Y = 120.
∴ O + Y – O ∩ Y = 720 + 720 – 120 = 1320.
Hence, 1320.
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