TCS Company Numerical Ability Permutation and Combination

The number of committes of size 10 that could be formed from 10 men & 10 women such that committee has atleast 6 women is
a)60626 b)210 c)10210 d)none

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TCS Other Question
.Y can do a work in 2/3 the time it takes X.Z can do the same work in ¾ the time it takes Y.When all three are typing at the same time what fraction of their total work does Y do
a)1/3 b)4/13 c)9/23 d)8/29 .A shop sells chocolates,it used to sell chocolates for Rs4.50 each but there were no sales at that price.When it reduced the price all chocolates sold but enabling to realize at 342.86 from chocolates alone.If the new price was not less than half of the original price.How many chocolates are sold
a)62 b)79 c)65 d)81