Infosys Company Logical Reasoning Seating Arrangement

There are 3 nurses and they work altogether only once in a week. no nurse is called to work for 3 consecutive days.
nurse 1 is off on tueseday,thursday and sunday.
nurse 2 is off on saturday.
nurse 3 is off on thursday,sunday.
no two nurses are off more than once a week.
Find the day on which all the 3 nurses were on work.

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Infosys Other Question
There are six cards in which it has two king cards. all cards are turned down and two cards are opened
a) what is the possibility to get at least one king.
b) what is the possibility to get two kings.
 There are 5 persons a,b,c,d,e and each is wearing a black or white cap on his head. a person can see the caps of the remaining 4 but can't see his own cap. a person wearing white says true and who wears black says false.
i) a says i see 3 whites and 1 black
ii) b says i see 4 blacks
iii) e says i see 4 whites
iiii) c says i see 3 blacks and 1 white.
Now find the caps wared by a,b,c,d and e