The number of ways to select 4 digits from 10 digits is
₁₀C₄ = 10!/(4!*6!)
= (10*9*8*7*6!)/(4*3*2*1*6!)
= (10*9*8*7)/(4*3*2)
= 210
If order is not important, the number of arrangements of 6,7,8,9 in any order is
4! = 4*3*2*1
= 24
The probability that these 4 digits are assigned is
24/210 = 0.1143
Answer: 77 hamburgers
Step-by-step explanation:
You can write an equation for this problem
x= hamburgers
2x= cheeseburgers
x+2x=231
3x=231
x=77
Step-by-step explanation:
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Answer:96 students
Step-by-step explanation:
total number of pupils = 200
number that scored above 90 = 20% of 200 = 20/100 x 200
= 0.2 x 200 = 40 students
remainder of students = 200 - 40 = 160 students
students that scored between 70 and 90 = 40% of remainder
= 40 % OF 160 = 40/100 X 160
= 0.4 X 160 = 64 students
students that scored below 70 marks = remainder of students - students that scored between 70 and 90 marks
= 160-64 = 96 students.
Answer:
520.5
Step-by-step explanation:
