Number System · Question 23 · Medium
What is the sum of all the divisors (factors) of 72, including 1 and 72?
- 123
- 195
- 180
- 168
Answer and explanation
Answer: B. 195
Explanation: 72 = 2^3 × 3^2. Sum of divisors = (1 + 2 + 4 + 8)(1 + 3 + 9) = 15 × 13 = 195.
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