How To Know Whether a Credit is Fake?Simple and fun test to find credit card frauds

Step one Take the credit card number below and double every other digit from the left (marked in raised numbers below). (I got this number off an ad on the internet). 5424 1801 2345 6789 5x2=10; 2x2=4; 1x2=2; 0x2=0; 2x2=4; 4x2=8; 6x2=12; 8x2=16. (You should come up with the following sequence of numbers: 10, 4, 2, 0, 4, 8, 12, and 16.) Step two Add