If k is a positive integer and n = 1.7 x 10^k, what is the value of n?
1. n^2 = 2.89 x 10^10
2. 20,000 < n < 200,000
OA: D
1. n^2 = 2.89 x 10^10
2. 20,000 < n < 200,000
OA: D
(1)
n = +- [ sqrt(2.89) x 10^5]
Ofcos, since k is positive, the negative root is eliminated, hence we are left with only 1 value for n
SUFFICIENT
(2)
Since k is an integer, only 1 value of k will satisfy the given inequality and will put n at 170,000.
SUFFICIENT
Hence (D)
