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JEE Mains · Maths · STD 12 - 13. probability

જો યાદ્દિચ્છક યલ \(X\) એ મૂલ્ય \(x\) લે તેની સંભાવના \(P ( X =x)= k (x+1) 3^{-x}, x=0,1,2,3, \ldots\) હોય, જ્યાં \(k\) અયળ છે, તો \(P ( X \geq 2)=........\)

  1. A \(\frac{7}{27}\)
  2. B \(\frac{11}{18}\)
  3. C \(\frac{7}{18}\)
  4. D \(\frac{20}{27}\)
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Answer & Solution

Correct Answer

(A) \(\frac{7}{27}\)

Step-by-step Solution

Detailed explanation

\(\sum \limits_{x=0}^{\infty} P ( X = x )=1\) \(k \left(1+2 \cdot 3^{-1}+3 \cdot 3^{-2}+4 \cdot 3^{-3}+\ldots \infty\right)=1\) \(\text { Let } \quad s =1+\frac{2}{3}+\frac{3}{3^2}+\frac{4}{3^3}+\ldots \infty\)…
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