An amusement park has 4 green and 3 blue entry doors whereas 2 orange and 5 yellow exit doors. In how many ways can a person enter and exit the amusement park?
Explanation:
Number of ways of entering the park = 7.
Number of ways of leaving the park = 7.
∴ Number of ways of entering and leaving the park = 7 × 7 = 49.
Hence, 49.
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