On average, 14% of the vehicles being driven along a stretch of road are heavy goods vehicles

Question:

On average, 14% of the vehicles being driven along a stretch of road are heavy goods vehicles (HGVs). A girl stands on a footbridge above the road and counts the number of vehicles, up to and including the first HGV that passes. Find the probability that she counts:

a. At most three vehicles 

b. At least five vehicles.

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