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P speaks truth in 70% of the cases and Q...

P speaks truth in 70% of the cases and Q in 80% of the cases. In what per cent of cases are they likely to agree in stating the same fact? Do you think, when they agree, means both are speaking truth?

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62 % no agree does not mean that they are speaking truth
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A speaks truth in 60% of the cases, while B in 90% of the cases. In what per cent of cases, are they likely to contradict each other in stating the same fact?

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