Q. 65.0( 1 Vote )

Mark the correct alternative in the following:

A fair die is thrown twenty times. The probability that on the tenth throw the fourth six appears is

A.

B.

C.

D. none of these

Ans. C

Answer :

Given:


Total outcomes= 610


Fourth 6 is at 10th place.


So other three 6 have to be placed at any of the remaining 9 places=9C356


For remaining 5 places we have 1,2,3,4&5


So total number of favorable cases


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