There are 5 flights (F1, F2, F3, F4, F5) connecting Mumbai - Kolkata and 3 roads (R1, R2, R3) connecting Kolkata-Nepal. In how many ways can a person travel from Mumbai to Nepal such that road R2 is accessible only for flight F3?
15
12
10
11
For each flight except F3, there are 2 connecting roads (R1 or R3).
So, for all flights apart from F3,
Total number of ways = 4 x 2 = 8
For flight F3, all three roads are accessible.
So, for F3, total number of ways = 1 × 3 = 3
Total number of ways = 8 + 3 = 11
Hence, option d.
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