JEE Main 8 Jan 2020 Shift 1 Solved Paper

Section: Mathematics

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Question : 62 of 75

Marks: +1, -0

Which one of the following is a tautology ?

[8 Jan 2020 Shift 1]

P‌⋀(P‌⋁Q)
P‌⋁(P‌⋀Q)
Q→(P‌⋀(P→Q))
(P‌⋀(P→Q))→Q

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