Answer:
thank you very much
Step-by-step explanation:
Answer:
155
Step-by-step explanation:
Number of math books = 7
Number of science books = 5
Number of engineering books = 10
We need to find the number of ways to pick two books with different subjects.
Solution :
We will use combination here .
If we need to choose r objects from total n objects ,

So, number of ways to pick two books of same subjects = 
Also, number of ways to select any two books = 
Therefore , number of ways to pick two books with different subjects =
number of ways to select any two books - number of ways to pick two books of same subjects = 231 - 76 = 155
Answer:
X= 5
Step-by-step explanation:
Answer: 13
Step-by-step explanation:
5+2x
When x=4
5+2(4)
5+8
= 13