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Mathematical Reasoning
Mary says "The number I am thinking is divisible by 2 or it is divisible by 3". This statement is false if the number Mary is thinking of is
$\begin {array} {1 1} (A)\;6 & \quad (B)\;8 \\ (C)\;11 & \quad (D)\;15 \end {array}$
jeemain
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mathematical-reasoning
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ch14
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q5
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asked
Jan 18, 2014
by
thanvigandhi_1
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Sep 3, 2014
by
sharmaaparna1
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1 Answer
Ans : (C)
This sentence contains the word "or" (disjunction).
A disjunction is only false if BOTH conditions are false.
The only number that is not divisble by 2 and is not divisible by 3 is 11.
answered
Jan 18, 2014
by
thanvigandhi_1
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