self Maths Puzzle

The sequence S is defined by S1=1 and Sn=Sn−1+n for n≥2. What is S36?

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self Other Question

On a trip to the local zoo, you find 6 exhibits that you want to see. In how many different orders can you visit the exhibits? Marina is taking chemistry, math, and physics classes at school. She has two books for chemistry, three for math, and one for physics. How many ways can Marina arrange her books on the shelf if she wants the books for each class to be next to each other?