small doubt on probability

[Arushi :))]

A lady declares that by taking a cup of tea, she can discriminate whether the milk or tea infusion was first added to the cup. It is proposed to test this assertion by means of an experiment with 12 cups of tea, 6 made in one way and 6 in the other, and presenting them to the lady for judgement in a random order.
Calculate the probability that on the null hypothesis that the lady has no discrimination power, she would judge correctly all the 12 cups, it being known to her that 6 are of each kind.

[kangkan]

here we have 12 cups of tea..6 in one way and 6 in other way..hence the total no of ways in which they can be presented is 12!/6!6!=924..since there is only one way tht she can be correct..therefore porb=1/924

[Arushi :))]

thanks and i really wanted to answer your doubt on trix, but haven't started with trix as of now.
sorry :(

[kangkan]

thats fine..have you done dev eco ..i guess you are following debraj ray..which cahpetrs?

[Arushi :))]

I haven't done it really :P
But i ll do all the important chapters
3,10, 6,8
I asked my seniors , they said these would be enough

[The Villain]

@arushi what about chapters on Lewis model n Harris Todaro?

[Arushi :))]

they are in chapter 10 i guess.
they have to be done.

[The Villain]

Thanxx :-)