Question
The number lock of a suitcase has 4 wheels , each labeled with ten digits from 0 to 9 .The lock opens with a sequence of four digits with no repeats . What is the probability of a person getting the right sequence to open the suitcase?
If a point C lies between 2 points A and B such that AC=BC , then prove that AC=1/2 AB.Explain by drawing figure.
AB is a chord of circle with centre O. CD is the diameter perpendicular to AB . Show that AD = BD
