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Question Number 247 by 123456 last updated on 25/Jan/15

A:C is false  B:C∨A is false  C:B is truth  then if possible F is truth or false?  F:(A∧B)∨(A∧C)∨(B∧C)

$$\mathrm{A}:\mathrm{C}\:\mathrm{is}\:\mathrm{false} \\ $$$$\mathrm{B}:\mathrm{C}\vee\mathrm{A}\:\mathrm{is}\:\mathrm{false} \\ $$$$\mathrm{C}:\mathrm{B}\:\mathrm{is}\:\mathrm{truth} \\ $$$$\mathrm{then}\:\mathrm{if}\:\mathrm{possible}\:\mathrm{F}\:\mathrm{is}\:\mathrm{truth}\:\mathrm{or}\:\mathrm{false}? \\ $$$$\mathrm{F}:\left(\mathrm{A}\wedge\mathrm{B}\right)\vee\left(\mathrm{A}\wedge\mathrm{C}\right)\vee\left(\mathrm{B}\wedge\mathrm{C}\right)\: \\ $$

Answered by prakash jain last updated on 17/Dec/14

C∨A=false ⇒ C is false , A is false  A∧B is false  A∧C is false  B∧C is false  Hence F is false.

$$\mathrm{C}\vee\mathrm{A}=\mathrm{false}\:\Rightarrow\:\mathrm{C}\:\mathrm{is}\:\mathrm{false}\:,\:\mathrm{A}\:\mathrm{is}\:\mathrm{false} \\ $$$$\mathrm{A}\wedge\mathrm{B}\:\mathrm{is}\:\mathrm{false} \\ $$$$\mathrm{A}\wedge\mathrm{C}\:\mathrm{is}\:\mathrm{false} \\ $$$$\mathrm{B}\wedge\mathrm{C}\:\mathrm{is}\:\mathrm{false} \\ $$$$\mathrm{Hence}\:\mathrm{F}\:\mathrm{is}\:\mathrm{false}. \\ $$

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