What is the problem I can help but there is none.
P(not 5) =5/6 and P(5) = 1/6
If the first 5 is rolled on the 5th roll then the first four rolls were not 5
P(5 on fifth roll) = 5/6 x 5/6 x 5/6 x 5/6 x 1/6 = 5^4/6^5 = 625/7776 = 0.080375...
1)Calculate the product:
21a + 10a - 3a
2)Collect like terms:
28a
Answer:
28a
