Multiple choice

Out of all the 2-digit integers between 1 and 100, a number has to be selected at random. What is the probability that the selected number is not divisible by 7?

  1. 13/90

  2. 12/90

  3. 78/90

  4. 77/90
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The number of 2-digit multiples of 7 = 13 $\therefore$        Probability of choosing a number not divisible by $7 = \dfrac{90-13}{90} = \dfrac{77}{90}$

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