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A lies on mon, tues, wed and speak truth on other days, B lies on thur, fri, sat and speaks truth on other days. One day A said I lied today and B said I too lied today. What is the day?

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TCS Other Question

There are Pepsi 1 liter and Oil 1 liter. It is given that 1 spoon of Pepsi is taken and is mixed with Oil. Then 1 spoon mixture is taken and is mixed with Pepsi. Which of the condition holds true. 1! + 2! + ...... + 50!=?
a)3.1035*10^64
b)2.1021*10^65
c)3.1035*10^63
d)3.1035*10^62