?

Number Theory

Free Version

Upgrade subject to access all content

Moderate

Divisibility Criterion for Prime 11: Find Correct One

NUMTH-SKCYWG

Find one correct method to check divisibility by $11$. Select ONE answer.

A

Write $n$ in decimal digits. If the last digit is $1$, then $11$ divides $n$.

B

Write $n$ in decimal digits. If the last two digits are $11$, then $11$ divides $n$.

C

Write $n$ in decimal digits. If the alternating sum of the digits is divisible by $11$, then $11$ divides $n$.

D

Write $n$ in decimal digits. If the sum of the digits is divisible by $11$, then $11$ divides $n$.