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In GW-BASIC, you can calculate the factorial of a number using a WHILE...WEND loop. First, initialize a variable for the factorial result (e.g., fact = 1) and a counter variable (e.g., i). Then, use a WHILE loop that continues as long as i is less than or equal to the number for which you want the factorial. Inside the loop, multiply fact by i, increment i, and finally print the result after the loop ends. Here's an example code snippet:

INPUT "Enter a number: ", n
fact = 1
i = 1
WHILE i <= n
  fact = fact * i
  i = i + 1
WEND
PRINT "Factorial of "; n; " is "; fact
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