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W, 4 bytes (inclusive)

.@*R

Explanation

ab.    % Generate inclusive range from a to b
   @   % Roll TOS down to show 2 operands
    *R % Reduce over the product of the list

W, 3 bytes (inclusive)

.*r

Explanation

ab.   % Generate inclusive range from a to b
   *  % Multiplication
    r % Preserve the operation's action & reduce by it

W d, 3 bytes (inclusive)

Ʀ⬣⑾

Explanation

After decompression:

.@*R

ab.    % Generate inclusive range from a to b
   @   % Roll TOS down to show 2 operands
    *R % Reduce over the product of the list

W, 4 bytes (inclusive)

.@*R

Explanation

ab.    % Generate inclusive range from a to b
   @   % Roll TOS down to show 2 operands
    *R % Reduce over the product of the list

W d, 3 bytes (inclusive)

Ʀ⬣⑾

Explanation

After decompression:

.@*R

ab.    % Generate inclusive range from a to b
   @   % Roll TOS down to show 2 operands
    *R % Reduce over the product of the list

W d, 3 bytes (inclusive)

Ʀ⬣⑾

Explanation

After decompression:

.@*R

ab.    % Generate inclusive range from a to b
   @   % Roll TOS down to show 2 operands
    *R % Reduce over the product of the list