TCS Company Numerical Ability Algebra

a question from set theory where we have to find no. Of subsets A={1,2,3,4,5,6,7,8,9,10} B={6,7,8,9,10} we have to find subset in B delta C

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TCS Other Question

some fig was given and we were needed to calculate min distance for T1 nd T2
Option were 800,900 other I don't remember
Last one
There are 20 persons sitting in a circle. In that there are 18 men and 2 sisters. How many arrangements are possible in which the two sisters are always separated by a man?
a. 18!x2

b. 17!
c. 17x2!

d. 12