A) 50
B) 49
C) 48
D) None of these
Correct Answer: B
Solution :
[b] If n is odd, \[{{3}^{n}}=4{{\lambda }_{1}}-1,{{5}^{n}}=4{{\lambda }_{2}}+1\] \[\Rightarrow {{2}^{n}}+{{3}^{n}}+{{5}^{n}}\] is not divisible by 4, as \[{{2}^{n}}+{{3}^{n}}+{{5}^{n}}\] will be in the form of \[4\lambda +2.\] Thus total number of ways of selecting ?n? is equal to 49.
You need to login to perform this action.
You will be redirected in
3 sec
