An "Armstrong number" is an n-digit number that is equal to the sum of the nth powers of its individual digits. For example, 153 is an Armstrong number because it has 3 digits and 1^3 + 5^3 + 3^3 = 153. What is the digit k in the Armstrong number 1,6k4 ?
A. 2
B. 3
C. 4
D. 5
E. 6
OA B
Source: Official Guide
A. 2
B. 3
C. 4
D. 5
E. 6
OA B
Source: Official Guide
