Question:
A letter of English alphabet is chosen at random. Determine the probability that the chosen letter is a consonant.
Solution:
Let E be the event of getting a consonant.
Out of 26 letters of English alphabets, there are 21 consonants.
$\therefore \mathrm{P}$ (getting a consonant) $=\mathrm{P}(\mathrm{E})=\frac{\text { Number of outcomes favourable to } \mathrm{E}}{\text { Number of all possible outcomes }}$
$=\frac{21}{26}$
Thus, the probability of getting a consonant is $\frac{21}{26}$.
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