Wierd Maths Question

This question appeared in our 2nd term test: In the number sequence 1,1,1,1,101 find the formula for the nth term and find the 6th term. I spent 10mins on this question!! Eventually, I still didn’t get the answer. How stupid, should have checked other questions when I had the time. If I had not wasted my time on that question could have got more than 34 for the test. Arghh…wasted. Soon after, Mr. Tan told us the formula: [100(n-1) (n-2) (n-3) (n-4)] 24+1. It was so complicating. At least I understood. In fact no one got the answer. Jia Hao’s answer was correct but he didn’t have the formula, 0 marks awarded... should have given at least 1 mark for getting the answer lehs.