- View Source..the ans is 8.. error in 1st line in previous mailOn Tue, Aug 2, 2011 at 7:41 PM, RAHAMATHULLAH ELYAS <raham90@...> wrote:
..the ans is not 2.. its '4'

..the way u ppl proceeded is right, but u forgot dat between 21 - 30 der are two 5's ..i.e. 25=5*5 ..one of the 5 multiplied wid 2 nd other wid 4..which gives two zeros..der fore it will be 8*8*2..whose unit place will be 8--On Fri, Jul 22, 2011 at 1:05 PM, pradeep barola <mjain.pkb@...> wrote:I am also getting 2 as answer:

1*2*3*4*5*6*7*8*9= it has 8 as the last non zero digitand doing this three times 8*8*8 has 2 as last non-zero digitPradeepOn Tue, Jun 21, 2011 at 3:32 PM, deepak narayanan <deepakraam@...> wrote:

Q1. There are 7 zeroes in the end of 30! (factorial 30). Which digit precedes these zeroes?

a.8

b.3

c.4

d.7I could get the number as 2 .Taking the first 10 numbers (10!) will end in10! = 1*2*3*4*5*6*7*8*9*10Eliminating: 1, 2,5 as they contribute only to the zeros we get3*4*6*7*8*9 = 8. 10! = 32...800.So,8 precedes the zeroes.Working on the same fashion for 30!,I'm getting 2 as the number that is not listed in the options.Anything wrong?-Deepak.Pradeep

regards,rahmath'

--regards,rahmath'