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That is the answer, but why? If you want to know the portfolio standard deviation for a four (4) stock portfolio you will have to

image text in transcribedThat is the answer, but why?

If you want to know the portfolio standard deviation for a four (4) stock portfolio you will have to calculate 4 variances and two co-variances, one tri-variance, one quadro-variance three co-variances two tri-covariances six co-variances only variances have to be calculated

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