11th Class Punjab Board Exams Quizzes MCQs Quizzes Punjab Mathematics 11th Class Model Paper Chapter No 3

Question:
3 + 6 + 9 + ………….. 3n =

Option A):
3n(n + 1)/2
Option B):
2n(n - 1)/3
Option C):
3n(n - 1)/2
Option D):
2n(n + 1)/3

Correct Answer is Option A):
3n(n + 1)/2