Скачать или смотреть 61. PASCAL'S TRIANGLE, COMBINATIONS, THE MEANING/FORMULA OF nCr (A-level Maths, Pure Maths Video 61)

This is video 61 in my series of A-level Pure Mathematics videos. In this video, we review what Pascal's triangle is. We then look at how we can use Pascal's triangle to find values of "nCr" (i.e. "out of n objects choose r objects"). We then proceed to look at how we can justify the formulae for nCr by using a real life example. This formula is n!/(r!(n-r)!) (where"!" is the factorial symbol. So again, in other words, nCr represents the number of combinations in which we can choose r objects out of a total of n objects, whereby the order in which we choose these r object is irrelevant.

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