I am also getting 2 as answer:
1*2*3*4*5*6*7*8*9= it has 8 as the last non zero digit
and doing this three times 8*8*8 has 2 as last non-zero digit
Pradeep
--
On Tue, Jun 21, 2011 at 3:32 PM, deepak narayanan <deepakraam@gmail.com> 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
__._,_.___
2IIM's Intensive Weekend Classes for CAT 2011 by IIM Alumni @ Chennai Starts Mar 20, 2011
http://www.2iim.com
Ascent's 2IIM Study Material for CAT - Comprehensive Course Material Prepared by IIM Alumni
http://www.2iim.com/IIM_CAT_classes_correspondence_courses/CAT_correspondence_course.shtml
http://www.2iim.com
Ascent's 2IIM Study Material for CAT - Comprehensive Course Material Prepared by IIM Alumni
http://www.2iim.com/IIM_CAT_classes_correspondence_courses/CAT_correspondence_course.shtml
MARKETPLACE
.
__,_._,___
