Answer:
Probability that one of them is mathematics and other two are either physics or history books = 0.51
Step-by-step explanation:
Given - A student needs to select 3 books from 3 different mathematics, 3 different physics and 1 history books.
To find - What is the probability one of them is mathematics and other two are either physics or history books ?
Solution -
Given that,
A student needs to select 3 books from 3 different mathematics, 3 different physics and 1 history books.
So,
Total number of books = 3 + 3 + 1 = 7
The student has to select 3 books
So, Total number of ways =
= 35
So,
Probability that one of them is mathematics and other two are either physics or history books is -
= 
= 
= 
= 0.51
⇒Probability that one of them is mathematics and other two are either physics or history books = 0.51
Answer:
108.75 square meter.
Step-by-step explanation:
<h3>Surface area of pentagon based pyramid:</h3>

Here, b is the base length of the pyramid. b = 3 m
a is the apothem of the pyramid. a = 3.5 m
s is the slant height of the pyramid. s = 11 m


Answer:2\sqrt(5)+9\sqrt(7)
Step-by-step explanation:
2\sqrt(20)-3\sqrt(7)=4\sqrt(5)-3\sqrt(7)
4\sqrt(5)-3\sqrt(7)-2\sqrt(5)=2\sqrt(5)-3\sqrt(7)
2\sqrt(5)-3\sqrt(7)+4\sqrt(63)=2\sqrt(5)+9\sqrt(7)