TS EAMCET · Maths · Probability
As a business strategy, of the new internet service subscribers selected randomly receive a special promotion. If a group of such subscribers signs for the service, then the probability that at least two of them get the special promotion is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
Consider Binomial probability distribution. Probability of success (p)=20100=15 Probability of failure (q)=1-15=45 Now, P(r≥2)=P(r=2)+P(r=3)+P(r=4)+P(r=5) =5C2152453+5C3153452+5C4154451+5C5155450 =155(640+160+20+1) =8213125
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