Show that 4128 0012 4389 0110 is an invalid visa credit card number.

a. 2(4+2+0+1+4+8+0+1) + 1 + (1+8+0+2+3+9+0+0) = 64, doesn't end in 0

b. 2(4+2+0+1+4+8+0+1) + 1 + (1+8+0+2+0+9+1+0) = 62, doesn't end in 0

c. 2(4+2+0+1+4+8+0+1) + 1 + (1+0+0+2+3+9+1+0) = 57, doesn't end in 0

d. 2(4+2+0+1+4+8+0+1) + 1 + (1+8+0+2+3+9+1+0) = 65, doesn't end in 0

What the options to that

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm