1.

Find the sum of all the co-prime numbers of 10.

Answer»

Solution :`10 = 2xx5`
Sum of all the co-prime NUMBERS of 10 is given by `10/2[varphi(10)=10/2(1-1/2)(1-1/5)=20`
The REQUIRED sum is 1 + 3 + 7 + 9 = 20


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