Examine the following statements : 1. All trains are run by diesel engine. 2. Some trains are run by diesel engine.

Monjur Alahi

Each of the following two items consists of four statements. Of these four statements, two cannot both be true, but both can be false. Study the statements carefully and identify the two that satisfy the above condition. Select the correct answer using the codes given below each set of statements:

Examine the following statements : 

1. All trains are run by diesel engine. 

2. Some trains are run by diesel engine. 

3. No train is run by diesel engine. 

4. Some trains are not run by diesel engine. 

Codes : 

(a) 1 and 2 (b) 2 and 3 (c) 1 and 3 (d) 1 and 4


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Salim Ahmed Kawsar

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(c) Statement 1 and 3 contradict each-other, hence both statements cannot be true together. But there are a situation where in both statements are false that is if some of the trains are run on diesel engine and some are not.

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