Sometimes the question summaries don’t get all their MathJax rendered. For example, from the summation tag questions you see this:

bad math jax rendering demo

It looks to me like this bug is caused by the truncation of the summaries when that interrupts the MathJax so you no longer have a correctly paired $....$ sequence to render:

I have no idea how to even start solving this example. Please, explain the best approach (step-by-step) to this summation with binomial coefficients: $$\sum_{k=j}^n (-1)^k\cdot\binom{n}{k}\cdot...

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