The formula to use is the nCr combination formula
n C r = (n!)/(r!*(n-r)!)
where the exclamation marks indicate factorial notation
Plug n = 10 and r = 2 into the formula
n C r = (n!)/(r!*(n-r)!)
10 C 2 = (10!)/(2!*(10-2)!)
10 C 2 = (10!)/(2!*8!)
10 C 2 = (10*9*8!)/(2!*8!)
10 C 2 = (10*9)/(2!)
10 C 2 = (10*9)/(2*1)
10 C 2 = 90/2
10 C 2 = 45
Answer: 45
Largest number that can be created from 123456 is 654321
Answer:
A reduction of 64.3 percent
Step-by-step explanation:
Initial price of Brent crude oil=$140 per barrel
Final price of Brent crude oil=$50 per barrel
The percentage change in price=((Final price-Initial price)/(Initial price))×100
(50-140)/140=-0.6429×100=-64.29
Rounding off to tenth of a percent=10/100=0.1
-64.29=-64.3 since 64.29 is nearer to 64.3 than 64.2
-64.3 percent implies a reduction of 64.3 percent
There was a reduction of 64.3 percent
Answer:
Step-by-step explanation:
I think 21 and 42