Answer: Option 'a' is correct.
Step-by-step explanation:
Since we have given that
Number of flights from New York to California = 6
Number of flights from California to New York = 7
Since if the flights are to be made on separate days,
So, they are independent events.
So, the number of different flight arrangements that can be made offer from New York to Hawaii would be
[tex]6\times 7\\\\=42[/tex]
Hence, Option 'a' is correct.