There is a 14-digit credit card number in which every 3 consecutive digits add to 20. Here is a part of it. Find the value of 'x'? _ _ _ 9 _ _ _ x _ _ _ 7 _ _

Interview Candidate
Jul 7th, 2005
7
14373

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Aaron C

Oct 25th, 2005

just consider the last 3 digits of the 14 digit no:... So as to make the sum 20 the combinations should be (7,9,4),(7,8,5),(7,7,6) and so on. so using trial and error method we can substitute (7,9,4) and complete the 14 digit sequence 94794794794794.THe answer being 4