I think it is a matter of choice and preference. There are so many currency pairs, which are being traded in Forex market. There are some pairs, which are traded in large numbers. The well-known currency pairs that are traded internationally are USD/EURO, USD/GBR, USD/YEN, EURO/CHF, GPB/CHF, EURO/YEN, etc. The basic reason behind this is their economies. US, UK, Europe and Japan have the biggest economies in the world and people prefer to trade in those currencies.
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