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A bag contains 6 white and 6 black balls. One by one the balls are drawn from the bag with replacement then the probability that 3rd time a white ball is drawn in 7th draw is:

Answer» <html><body><p>`5/16`<br/>`5/12`<br/>`15/64`<br/>`15/128`</p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :In first 6 <a href="https://interviewquestions.tuteehub.com/tag/draws-959535" style="font-weight:bold;" target="_blank" title="Click to know more about DRAWS">DRAWS</a> <a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a> white balls are drawn and 7th <a href="https://interviewquestions.tuteehub.com/tag/draw-959456" style="font-weight:bold;" target="_blank" title="Click to know more about DRAW">DRAW</a> to be a white ball. <br/> Required probability `=""^(6)C_(2)(1/2)^(2)(1/2)^(<a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a>) xx 1/2 = 15/128`</body></html>


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