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<p>This is a good introduction to probability. A lot of the times, you just have to think the problems through. Don’t just try cramming a bunch of formulas. Also, try working with easier problems first before you move on to hard ones.</p>
<p>It’s like learning how to ride a bike. Before you can do that, you have to learn to crawl, walk, and run first, and then use training wheels before you can get into the hard stuff. It goes with everything you learn.</p>