It is 15100. First 0 is no important.
Answer: a)
b) 
<u>Step-by-step explanation:</u>
a) In order to get an even number, you have the 3 different scenarios:
1) Even, Even, Even, Even 
2) Even, Even, Odd, Odd
3) Odd, Odd, Odd, Odd 
<em>Order doesn't matter</em>
Add them up to get your answer: 
b) If one die is a 2 and another is a 3 and the other two dice can be any number, then you have 1 possibility for a 2, 1 possibility for a 3, and 6 possibilities for each of the other two dice.

Answer:
∠AOB=40°
∠BOC=68°
Step-by-step explanation:
Hope this helps Have a nice day
Well the ration would be 2:3 if that helps at all.
Answer:
Option A is correct, i.e. n = 360.
Step-by-step explanation:
Given the monthly payments are made for 30 years.
We know 1 year = 12 months. It means they paid 12 installments in a year and they paid it for complete 30 years.
So, total installments = 12 installments in a year x 30 years = 360 installments.
Therefore, the value for n in the following future value ordinary annuity formula would be 360.
Hence, option A is correct, i.e. n = 360.