diff --git a/Exercise 3/11 - Doble lokker/11c.py b/Exercise 3/11 - Doble lokker/11c.py
new file mode 100644
index 0000000..73eb01d
--- /dev/null
+++ b/Exercise 3/11 - Doble lokker/11c.py	
@@ -0,0 +1,45 @@
+from math import sqrt
+
+
+# O(√n)
+def isPrime(n):
+  if n < 2: return False
+  if n == 2 or n == 3 or n == 5: return True
+  limit = int(sqrt(n))
+  numberToCheck = 5
+  while numberToCheck <= limit:
+    if n % numberToCheck == 0: return False
+    numberToCheck += 2 # Skip all even numbers
+  return True
+
+
+# Would be O(log₂(n)), but isPrime(n) is used,
+# thus it's O(√n)
+def findAllFactors(n):
+  factors = []
+  while not isPrime(n):
+    for i in range(2, int(n)):
+      if n % i == 0:
+        factors.append(i)
+        n = n / i
+        break
+  factors.append(int(n))
+  return factors
+
+
+def factorize(n):
+  factors = []
+  if isPrime(n):
+    factors.append(n)
+  else:
+    factors = findAllFactors(n)
+  return factors
+
+
+if __name__ == "__main__":
+  n = int(input('Skriv inn et positivt heltall: '))
+  factors = factorize(n)
+  if len(factors) == 1:
+    print(f'{n} er et primtall')
+  else:
+    print(f'{n} = {" * ".join([str(tall) for tall in factorize(n)])}')
\ No newline at end of file
diff --git a/Exercise 3/11 - Doble lokker/11d.py b/Exercise 3/11 - Doble lokker/11d.py
new file mode 100644
index 0000000..669d1f9
--- /dev/null
+++ b/Exercise 3/11 - Doble lokker/11d.py	
@@ -0,0 +1,62 @@
+from random import randint
+
+
+class multiplicationGame:
+  def __init__(self, min, max, tries):
+    self.min = min
+    self.max = max
+    self.tries = tries
+    self.updateProblem()
+
+  def generateNewMultiplicationProblem(self) -> (int, int):
+    number = lambda: randint(self.min, self.max)
+    self.currentProblem = (number(), number())
+
+  def updateProblem(self):
+    self.generateNewMultiplicationProblem()
+    self.currentTries = self.tries
+
+  def userWantsNewQuestion(self) -> bool:
+    while True:
+      answer = input(
+          'Er det ønskelig med flere spørsmål? Skriv 1 for ja og 0 for nei: ')
+      if answer in ['1', '0']:
+        return bool(int(answer))
+      else:
+        print('Skriv 1 for ja og 0 for nei')
+
+  def checkIfUserWantsNewQuestion(self):
+    if not self.userWantsNewQuestion():
+      exit(0)
+
+  def wrongAnswer(self):
+    self.currentTries -= 1
+    if self.currentTries == 0:
+      print(
+          'Dessverre klarte du ikke dette regnestykket, men vent så får du et nytt et:)'
+      )
+      self.checkIfUserWantsNewQuestion()
+      self.updateProblem()
+    else:
+      print(f'Dessverre ikke riktig. Du har {self.currentTries} forsøk igjen.')
+
+  def correctAnswer(self):
+    print('Gratulerer, det er helt riktig!')
+    self.checkIfUserWantsNewQuestion()
+    self.updateProblem()
+
+  def update(self):
+    answer = int(input(f'Hva blir {self.currentProblem[0]} * {self.currentProblem[1]}? '))
+    if answer == self.currentProblem[0] * self.currentProblem[1]:
+      self.correctAnswer()
+    else:
+      self.wrongAnswer()
+
+  def loop(self):
+    while True:
+      self.update()
+
+
+if __name__ == "__main__":
+  game = multiplicationGame(min=0, max=10, tries=3)
+  game.loop()