This question is to do with binomial distribution. 'Explore' means there is no right answer. Please help me come up with a way of approaching this, showing all working out. Thanks

Watch The Wall - She's So incredibly Lucky! Consider the simplified situation in which at each level of the wall, the ball can only fall one cell to the left or the right on the next level down. Both of these options have equal probability. There are 7 cells at the top of the wall and 15 at the base. The number of cells in each row increases from 7 to 15 and thereafter, the wall is rectangular. There are 20 rows in total. In the last row of the wall the cells contain the value to be 'won'. These are, in order from left to right: $1, $50 000, $100, $100 000, $10, $200 000, $1, $300 000, $1, $400 000, $10, $500 000, $100, $1 000 000 and $1. Explore the probability that a person will win' $1 000 000 on the first ball they drop from a cell of their choice