14.Probability
hard

જેના પૃષ્ઠો - $2,-1,0,1,2,3$ વડે અંકિત હોય તેવા એક સમતોલ પાસાને પાંચ વખત ઉછાળતાં તેના પરિણામોનો ગુણાકાર ધન હોય, તેની સંભાવના $...........$ છે.

A

$\frac{881}{2592}$

B

$\frac{521}{2592}$

C

$\frac{440}{2592}$

D

$\frac{27}{288}$

(JEE MAIN-2023)

Solution

Either all outcomes are positive or any two are negative.

$\text { Now, } p = P \text { (positive) }=\frac{3}{6}=\frac{1}{2}$

$q = p \text { (negative })=\frac{2}{6}=\frac{1}{3}$

Required probability

$={ }^5 C_5\left(\frac{1}{2}\right)^5+{ }^5 C_2\left(\frac{1}{3}\right)^2\left(\frac{1}{2}\right)^3+{ }^5 C_4\left(\frac{1}{3}\right)^4\left(\frac{1}{2}\right)^1$

$=\frac{521}{2592}$

Standard 11
Mathematics

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