jeunesis wrote:

:?

What if the value of d is 8,9,10....?

f = 30! = 265252859812191000000000000000000

Sorry. I just calculated it by excel...

so IMO, 10^8, 10^9, 10^10...also possible...

This is incorrect. There will be 7 zeros only. Thats how its calculated:

Numbers multiple of 5 = 5,15,25 = 3

Numbers multiple of 25 = 25 = 1

Numbers multiple of 10 = 10,20,30 = 3

So total zeros = 3+1+3 = 7

St1: d may be 1,2,3,4,5,6,7 : INSUFF

St2: d may be 6,7,....... and many more : INSUFF

Combined: d must be 7 : SUFF

So it must be C.

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SAID BUSINESS SCHOOL, OXFORD - MBA CLASS OF 2008