A letter is chosen at random from the letter of the word $" P R O B A B I L I T Y "$ . Find the probability that it is not a veowel.

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Solution

Given word ''PROBABILITY''
The probability that is not a vowel $= P, R, O, B, A, T, Y = 7$
Total no. of letters $= 11$
No. of favorable outcomes $= 7$ .
$∴= \frac{N o . o f f a v o u r a b l e o u t c o m e s}{T o t a l n o . o f o u t c o m e s}$
$\Rightarrow$ probability = $7 / 11$
$∴$ The probability that is not a vowel has $7 / 11$ .
$∴$ So, the answer is $^{'} 7 / 11^{'} .$

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