What sum of 3 numbers is 12 But the numbers should not be repeated?

Answer 1

12.

x+y+z=12

x<y<z ----> so that it wouldnt repeat.

When x is 0:

(0,1,11)

(0,2,10)

(0,3,9)

(0,4,8)

(0,5,7)

when x is 1:

(1,2,9)

(1,3,8)

(1,4,7)

(1,5,6)

When x is 2:

(2,3,7)

(2,4,6)

When x is 3:

(3,4,5)

So total, it's 12.