Spartan85 wrote:
Answer : D
If product a*b*c has exactly 3 prime factors,
a can have maximum 3 prime factors.
eg.
a= 2^1 * 3^1 * 5^1
b = 2^2 * 3^2 * 5^2
c = 2^3 * 3^3 * 5^3
Now a * b* c = 2^6 * 3^6 * 5^6
The question doesn't say that it has 3 distinct prime factors. It simply says 3 prime factors, and usually, unless the question stem explicitly says 'distinct', we take TOTAL number of prime numbers into account. So there are 6 + 6 + 6 = 18 prime factors in your expression.
Statistics : Posted by ZIX • on 22 Feb 2017, 06:26 • Replies 6 • Views 6076
