A triangular array of 2016 coins has 1 coin in the first row, 2 coins in the second row, 3 coins in the third row, and so on up to N coins in the N th row. What is the sum of the digits of N ?
Answer Choices
A. 6
B. 7
C. 8
D. 9
E. 10
A triangular array of 2016 coins has 1 coin in the first row, 2 coins in the second row, 3 coins in the third row, and so on up to N coins in the N th row. What is the sum of the digits of N ?
Answer Choices
A. 6
B. 7
C. 8
D. 9
E. 10