TCS Company Logical Reasoning Number Series

Mr Mrs smith have invited 9 of their friends and their spouses for a party at the waikiki beach resort. They stand for a group photograph. If Mr smith never stands next to Mrs smith(as he says they are always together otherwise ), how many ways the group can be arranged in a row for the photograph?
a)20!
b)19!18!
c)1819!
d)219!

Read Solution (Total 1)

C) 18*19!

total 20 persons are there..
we can arrange them in 20!ways
consider Mr.& Mrs.smith take them as a unit so 18+1=19
19!2! cases are there when they are together which is not allowed here.
so possible arrangements = 20!-(19!2!)= 19!(20-2) = 18*19!
11 years agoHelpfull: Yes(122) No(6)

TCS Other Question

x,y,z, and w are integers.the expression X-Y-Z is even and the expression Y-Z-Wis odd. If x is even what must be true?
a)w must be odd
b)Y-z must be odd
c)w must be odd
d)z must be odd Tim and Elan are 90km away one another . they are starting to move towards each other simultaneously, Tim at a speed of 10 kmph and Elan at a speed of 5 kmph . if every hour they double their speeds, What is the distance that Tim will pass until he meets Elan?
a)45km
b)60km
c)30km
d)80km