Question : How many positive factors of 160 are there?
Option 1: 6
Option 2: 8
Option 3: 5
Option 4: 12
Correct Answer: 12
Solution :
160 = 2
5
× 5
If N = a
m
× b
n
, where a and b are prime numbers, then the number of positive factors of N = (m+1) × (n+1)
Total number of positive factors of 160 = 6 × 2 = 12
Hence, the correct answer is 12.
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