Blocks are to picked out from the given cube, but adjacent blocks can’t be picked, so the maximum number of blocks that can be picked are:
A box contains 10 balls numbered from 0 to 9. The balls are identical, so when Karan starts picking a ball out of the bag, he is equally likely to pick anyone of them. Karan picked a ball and replaced it in the bag after noting its number. He repeated this process 2 more times. What is the probability that the ball picked first is numbered higher than the ball picked second and the ball picked second is numbered higher than the ball picked third?