19 is A
You can work it out...the checksum is still the same if you correct the sequence
ie. if one of them is changed, then the parity bit will also change back, so it will add to the same checksum.
um... u just proved that 17 is D....read the answers first...
Transaction-video is many to one because there are many barcodes in each transaction, but each video has only one barcode
I still don't get it tho...i can see how u guys got your answers, but shouldnt the troughs be different magnitudes if one is bigger than the other...??