If z = x^n - 19, is z divisible by 9?
1) x = 10; n is a positive integer
2) z + 981 is a multiple of 9
1) x = 10; n is a positive integer
2) z + 981 is a multiple of 9
Hi,
z is one of -9, 81, 981, 9981, 99981 etc. Answer to the question 'Yes'.
if z + 9(109) is a multiple of 9; then z should also be a multiple of 9. Answer to the question 'Yes'.
Hence, answer is D
However, considering that gmatmachoman has posted this, something tells me that it cannot be so easy ;-D ... Am I missing something ...
