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xQy ⇔ x > y2
If I study, then I will not fail mathematics
if I don't play basketball, then I will study
But I failed mathematics
Therefore I must have played basketball
2.The 3rd and 7th term of a G.P. are 81 and16 respectively, find the 1st and 5th term
3.A student is to answer all the nine questions in an examination. It is believed that the sequence in which the questions are answered may have a considerable effect on the performance of the student. In how many different order can the question be answered
4.A bus starts with 6 people and stops at 10 different stops. how many different ways can the 6 people depart if any passenger can depart at any bus stop
5. how many 3 digits numbers greater than 300 can be formed using the digits 1, 2, 3, 4, 5 if no digit can be repeated and the first digit cannot be 3?
6.In how many way can 6 people take place at a round table?