Question

  

Suppose a homogeneous array with 6 rows and 8 columns is stored in row major order starting at address 20 (base 10). If each entry in the array requires only one memory cell, what is the address of the entry in the third row and fourth column? What if each entry requires two memory cells

Each piece of data stored in an array has a unique address. And the addressing traverses a zig-zag pattern starting with (0,0) and ending at (n,n).