A box contains 20 identical balls of which 10 are blue and 10 are green. The balls are drawn at random from the box. One at a time with replacement. The probability that a blue ball is drawn 4th time on the 7th draw is

A box contains 20 identical balls of which 10 are blue and 10 are gree

1.	A box contains 20 identical balls of which 10 are blue and 10 are green. The balls are drawn at random from the box. One at a time with replacement. The probability that a blue ball is drawn 4th time on the 7th draw is
A.	\[\frac{27}{32}\]
B.	\[\frac{5}{64}\]
C.	\[\frac{5}{32}\]
D.	\[\frac{1}{2}\]
Answer» D. \[\frac{1}{2}\]

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A box contains 20 identical balls of which 10 are blue and 10 are green. The balls are drawn at random from the box. One at a time with replacement. The probability that a blue ball is drawn 4th time on the 7th draw is

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