Question

please give the answe of the question.​

Answer 1

ANS.

25

SOLUTION

ANS.

25

SOLUTION

Probability of required outcome is  1/3 for 1st time  

Probability of required outcome is  2/3∗1/3 for 2nd time  

Probability of required outcome is  2/3∗2/3∗1/3 for 3rd time  

So we want even number of tosses