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14. probability — MATHS STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceMATHS14. probability1 Mark
MCQ
An integer is chosen at random from the integers $\{1,2,3, \ldots \ldots . .50\}$. The probability that the chosen integer is a multiple of atleast one of $4,6$ and $7$ is
  • A
    $\frac{8}{25}$
  • ✓
     $\frac{21}{50}$
  • C
    $\frac{9}{50}$
  • D
     $\frac{14}{25}$
✓

Answer

Correct option: B.
 $\frac{21}{50}$
b
Given set $=\{1,2,3, \ldots \ldots . .50\}$

$\mathrm{P}(\mathrm{A})=$ Probability that number is multiple of $4$

$P(B)=$ Probability that number is multiple of  $6$

$\mathrm{P}(\mathrm{C})=$ Probability that number is multiple of  $7$

Now,

$\mathrm{P}(\mathrm{A})=\frac{12}{50}, \mathrm{P}(\mathrm{B})=\frac{8}{50}, \mathrm{P}(\mathrm{C})=\frac{7}{50}$

again

$ P(A \cap B)=\frac{4}{50}, P(B \cap C)=\frac{1}{50}, P(A \cap C)=\frac{1}{50} $

$ P(A \cap B \cap C)=0$

Thus

$ P(A \cup B \cup C)=\frac{12}{50}+\frac{8}{50}+\frac{7}{50}-\frac{4}{50}-\frac{1}{50}-\frac{1}{50}+0$

$ =\frac{21}{50}$

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