TCS
Company
Numerical Ability
Number System
The number of natural numbers n such that (n+1)^2/(n+7) is an integer, is
a) 4 b) 5 c) 6 d) None of these
Read Solution (Total 6)
-
- 36/12
=3
so answer will be 5 - 11 years agoHelpfull: Yes(10) No(2)
- n+1)^2/n+ 7 = k
k= (n+7)^2 /n+7 – (12n + 48)/n+7
if k is integer then (12 + 48)/n+7 has to be an integer.
12n +48/n+7=12(n+4)/n+7.
= 12 (n+7 -3)/n+7
36/n+7 has to be an integer.
n+7 = 9 ,12 , 18 , 36
n can take 4 values - 11 years agoHelpfull: Yes(9) No(2)
- a) 4
n can take 4 values... 2,5,11,29 - 11 years agoHelpfull: Yes(3) No(3)
- Its answer is 5
- 11 years agoHelpfull: Yes(2) No(1)
- b) 6 is the correct ans. if we put n=5 in eq. gives integer value.....so
- 11 years agoHelpfull: Yes(0) No(3)
- answer is c which is 5.
- 6 years agoHelpfull: Yes(0) No(1)
TCS Other Question