1003057902

SubArea: 
Arithmetic sequences
Level: 
A
Project ID: 
1003057902
Accepted: 
1
Clonable: 
0
Easy: 
1
The \( 13 \)th term of an arithmetic sequence is \( 64 \) and the \( 21 \)st term is \( 32 \). Find the common difference.
\( -4 \)
\( 4 \)
\( 8 \)
\( -8 \)
\( 2 \)