Mathematical Reasoning Set 3

Contradiction ✘ Tautology ✘ Neither (a) nor (b) ✘ None of these ✔ NULL ✔ NULL NULL

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

Tautology ✘ Contradiction ✘ Neither tautology nor contradiction ✘ Either tautology or contradiction ✔ NULL ✔ NULL NULL

If the pressure does not increase the volume does not decrease ✘ If the volume increases, the pressure decreases ✘ If the volume does not decreases, the pressure does not increase ✘ If the volume decreases, then the pressure does not increase ✔ NULL ✔ NULL NULL

✘ ✘ ✘ None of these ✔ NULL ✔ NULL NULL

✘ ✘ ✘ ✔ NULL ✔ NULL NULL

A contradiction ✘ A tautology ✘ Either a tautology or a contradiction ✘ Neither a tautology nor a contradiction ✔ NULL ✔ NULL NULL

A quadratic equation has always a real root ✘ The number of ways of seating 2 persons in two chairs out of persons is ✘ The cube roots of unity are in GP ✘ None of the above ✔ NULL ✔ NULL NULL

If a number is divisible by 15, then it is not divisible by 5 and 3 ✘ A number is divisible by 15 and it is not divisible by 5 and 3 ✘ A number is divisible by 15 and it is not divisible by 5 or 3 ✘ A number is not divisible by 15 or it is not divisible by 5 and 3 ✔ NULL ✔ NULL NULL

A tautology ✘ A contradiction ✘ Neither a tautology or a contradiction ✘ None of these ✔ NULL ✔ NULL NULL