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Mathematics

A letter of English alphabet is chosen at random from English alphabets.

Assertion(A): The probability that the chosen letter is not a consonant is 5 : 52.

Reason(R): The probability of an event = Total number of outcomesNumber of favourable outcomes\dfrac{\text{Total number of outcomes}}{\text{Number of favourable outcomes}}

  1. A is true, R is false.

  2. A is false, R is true.

  3. Both A and R are true and R is correct reason for A.

  4. Both A and R are false.

Probability

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Answer

Given, there are 26 letters in the English alphabet.

There are total 5 (a, e, i, o, u) vowels.

The remaining letters are consonants, (21 consonants).

By formula,

The probability of an event = Number of favourable outcomesTotal number of outcomes\dfrac{\text{Number of favourable outcomes}}{\text{Total number of outcomes}}

So, reason (R) is false.

Probability that the chosen letter is not a consonant = NumberofvowelsTotalnumberofenglishalphabets=526\dfrac{Number of vowels}{Total number of english alphabets} = \dfrac{5}{26}

So, assertion (A) is false.

∴ Both A and R are false.

Hence, option 4 is the correct option.

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