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Discrete Maths - Sets

Avatto > > GATE COMPUTER SCIENCE > > Practice Questions > > Engineering Maths > > Discrete Maths > > Sets

21. Let R be a relation "(x-y) is divisible by m", where x, y, m are integers and m > 1, then R is

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22. If f : A ---> B is a bijective function, then f -1of =

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23. The set of all real numbers under the usual multiplication operation is not a group since

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24. If (G, .) is a group such that (ab)- 1 = b-1 a-1, ∀ a, b ∈ G, then G is a/an

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25. If * is defined on R* as a * b = (ab/2) then identity element in the group (R*, *) is

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