(1) 30 is a factor of the square of n
if n is an integer then this must be true
but if n is a decimal containing sqrt(3)*sqrt(5)*sqrt(2)
then this is false
INSUFF
(2) 30 is a factor of 2n
30 may not be a fcator of n i.e n only has 5,3 as factors,2n introduces the 2
INSUFF
together
then n cannot have sqrt(3)*sqrt(5)*sqrt(2) i.e n must be an integer so
30 is a factor
C
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