If "No scientists are philosophers" is true, which one of the following propositions is true?

If '+' means '×', '−' means '÷', '×' means '+' and '÷' means '−', then which one of the following equations is correct?

Which one of the following valid conclusion can be derived from the following premises? Premises: 1. All scientists are graduates. 2. No supervisors are graduates. Conclusion:

Which number has same property as of the following numbers? (957, 777, 876)

Which one of the following years will have the same calender as of 2009?

Which pair of numbers given in options is similar to the pair of numbers (289, 784)?