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Question

If A={(a,b,c):a,b,c are prime numbers and a+b+c=9}, then the number of ordered triplets is

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Solution

Here, a,b,c are prime numbers and a+b+c=9
a=2,b=2,c=5;
a=2,b=5,c=2;
a=5,b=2,c=2;
a=3,b=3,c=3

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