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Best answer
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2 votes
For odd no of tosses

We have

1, 3 ,5,7.........

Q

(1/2)1+ (1/2)3 +(1/2)5 +(1/2)7 ..........

As we can see this is decreasing gp series

So sum ut upto infinity.

S=a/(1-r)

a is first term of the series

r is common. Ratio.

So answer is 0.50/0.75

= 2/3

(c) option
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