Respected Sir , Thanks for posting these precious videos. We just can't thank you enough. Please take this question and explain in a lucid manner as you always do. I tried it many times but can't get through. How many distinct terms are there in the expansion of (1+ x^7 + x ^13) ^100 ? (PS: ^ denotes raised to the power) Sir, Please explain the solution to this in next video ... please... please... please sir. The given answer is 1235