Update mathgen.py

Adding a function for getting factorial of a random integer.

mathgenerator/mathgen.py

@@ -386,6 +386,16 @@ def primeFactors(minVal=1, maxVal=200):
     problem = f"Find prime factors of {a}"
     solution = f"{factors}"
     return problem, solution
+def factorial(maxlength=10):
+    a=random.randint(0,maxlength)
+
+    d=1
+    problem=a
+    for i in range(a):
+        a=(i+1)*d
+        d=a
+    solution=d
+    return " The Factorial for {} is {} ".format(problem, solution)
 
 # || Class Instances
 
@@ -420,3 +430,4 @@ distance2Point = Generator("Distance between 2 points", 24, "Find the distance b
 pythagoreanTheorem = Generator("Pythagorean Theorem", 25, "The hypotenuse of a right triangle given the other two lengths a and b = ", "hypotenuse", pythagoreanTheoremFunc)
 linearEquations = Generator("Linear Equations", 26, "2x+5y=20 & 3x+6y=12", "x=-20 & y=12", linearEquationsFunc) #This has multiple variables whereas #23 has only x and y
 primeFactors = Generator("Prime Factorisation", 27, "Prime Factors of a =", "[b, c, d, ...]", primeFactors)
+factorials = Generator("Factorials", 28, "Factorial of a = ", "xyz", factorial)