14.Probability
normal

જો ત્રણ પાસાને ફેંકવવામા આવે અને તેના પર આવતા પૂર્ણાકોનો ગુણાકાર કરતા તેને  $4$ વડે વિભાજય હોય તેની સંભાવના મેળવો. 

A

$\frac{3}{8}$

B

$\frac{1}{2}$

C

$\frac{5}{8}$

D

$\frac{3}{4}$

Solution

Let us divide the outcomes into three separate cases :

$I.$ Exactly one has even outcome

${P_1} = \frac{{{\,^3}{C_1} \times 1 \times 3 \times 3}}{{6 \times 6 \times 6}} = \frac{1}{8}$

$II.$ Exactly two have even outcomes

$P_{1}=\frac{^{3} C_{1} \times 3 \times 3 \times 3}{6 \times 6 \times 6}=\frac{3}{8}$

$III.$ Exactly have even outcomes

$P_{3}=\frac{3 \times 3 \times 3}{6 \times 6 \times 6}=\frac{1}{8}$

$\therefore \mathrm{P}=\mathrm{P}_{1}+\mathrm{P}_{2}+\mathrm{P}_{3}=\frac{5}{8}$

Standard 11
Mathematics

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