The sum of factors of 1520 except the unity is : – InterviewSolution

InterviewSolution

1.	The sum of factors of 1520 except the unity is :
Answer» 3720 2730 2370 none of these Solution :SINCE 2520 = `2^4xx5^1xx19^1` `therefore` Sim of all FACTORS of 1520 = `((2^5-1)(5^2-1)(19^2-1))/(2-1)(5-1)(19-1) = (31xx24xx360)/(1xx4xx18) = 3720` But since UNITY is to be excluded. `therefore` The net SUM of the factors = 3719

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