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There are four bus lines between $A$ and $B$; and three bus lines between $B$ and $C$. The number of way a person roundtrip by bus from $A$ to $C$ by way of $B$ will be

- $12$
- $7$
- $144$
- $264$

+1 vote

The number of bus lines between a and b =4

The number of bus lines between b and c =3

The number of possible combinations between a and c going through b are 4 * 3 = 12.

if you're talking about round trip, he has 12 possible ways to get there and 12 possible ways to get back, so the total possible ways is 12 * 12 = 144.

The number of bus lines between b and c =3

The number of possible combinations between a and c going through b are 4 * 3 = 12.

if you're talking about round trip, he has 12 possible ways to get there and 12 possible ways to get back, so the total possible ways is 12 * 12 = 144.

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