A grocer stacks oranges in a four-sided pyramid that is 6 layers high. How many oranges are in the pile?
The explicit formula for a pyramidal sequence is Pin) =
nin + 1)(2n +1)
6
A. 91
B. 546
C. 36
D. 105

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places