PUNE MCA Exam 2015 Question Paper with answers for online practice

50 defective bulbs and 50 non-defective bulbs are selected at random, one by one with replacement. If X, Y, Z are the events defined as-

X : Chance of getting 1st bulb defective.

Y : Chance of getting 2nd bulb non defective.

Z : chance of getting both defective or both nondefective.

Then which of the following is true;