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प्रश्न
The probability of guessing the correct answer of a certain test question is `x/12`. If the probability of not guessing the correct answer is `5/6` then find the value of x.
बेरीज
उत्तर
Given:
Probability of guessing a correct answer to a certain question is `x/12`
Probability of not guessing a correct answer to the same question `5/6`
To find:
The value of x = ?
Calculation:
`x/12 + 5/6 = 1` ...(∵ sum of the probabilities of an even and its complement is) always 1)
`x/12 + 10/12 = 1`
`(x+10)/12 = 1`
x + 10 = 12
x = 12 − 10
x = 2
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