For how many different pairs of positive integers $$\((a, b)\)$$, with greatest common factor 1 , and with $$\(a> b\)$$, does $$\(a b=30!\)$$ ? [NOTE: 30! is the product of the first 30 positive integers.]

A.
240
B.
512
C.
1024
D.
\(\frac{30!}{10!}\)
Mathematics
Competition
Math League
Exam No:2022 First Round Grades 8-9 Year:2022 Question No:25

Answer:

B

Knowledge points:

G8-9 - Number Theory - Factorials (Simplification & Properties)

Solution:

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