Note the frequency of two-wheelers, three-wheelers, and four-wheelers passing by your school gate during a specific time interval. Calculate the probability that any one vehicle chosen from the total vehicles observed is a two-wheeler.

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(N/A) To find the probability, follow these steps:
$1$. Let $n_1$ be the number of two-wheelers, $n_2$ be the number of three-wheelers, and $n_3$ be the number of four-wheelers observed.
$2$. Calculate the total number of vehicles observed: $N = n_1 + n_2 + n_3$.
$3$. The probability $P$ of selecting a two-wheeler is given by the ratio of the number of two-wheelers to the total number of vehicles.
$4$. Formula: $P(\text{two-wheeler}) = \frac{n_1}{N} = \frac{n_1}{n_1 + n_2 + n_3}$.

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