C & C++:How to find GCD of four numbers?

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6)	How to find GCD of four numbers?
Answer)	Take 4 numbers.The smallest number has to be found out.Then divide each number by that numbers which are less than that smallest number. e.g.5,15,75,20 smallest-5 so divide each numbers by 1,2,3,4,5. The GCD will be that number which divides all the number.(here 5)
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