fac <- 1
x <- c(1:12)
for(i in x){
  fac = fac*i
}
print(fac)
## [1] 479001600
num_vec <- seq(from = 20,to = 50, by = 5)
num_vec
## [1] 20 25 30 35 40 45 50
factorial <- function(a,b,c){
     x1 = (-b+(b^2-4*a*c)^0.5)/(2*a)
     x2 = (-b-(b^2-4*a*c)^0.5)/(2*a)
     print(c(x1,x2))
}
factorial(1,4,2)
## [1] -0.5857864 -3.4142136

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