# C22 278

A = matrix(c(1,2,3,6), ncol = 2, nrow = 2)
A

##      [,1] [,2]
## [1,]    1    3
## [2,]    2    6

det(A)

## [1] 0

A=(1*6-2*3)
A

## [1] 0

#M10 278

# A =matrix(c(2,3,4,k), ncol = 2, nrow = 2)
#|A|=2k-12=0
#k=6
A =matrix(c(2,3,4,6), ncol = 2, nrow = 2)
det(A) #K=6 

## [1] 0