TS EAMCET · Maths · Probability
A fair coin is tossed times. The probability that the tail will appear atleast thrice is
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
The probability of getting k successes is Pr≥k=∑r=knCrprqn-rn.Where n is number of trials, p & q are probability of success and failure respectively. Here, n=15, p=12, q=12 Therefore, Patleast 3 tails=P3≥r P=1-Pr=0-Pr=1-Pr=2…
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