# Concept derivation guides

299 concept teaching guides, separate from the 36,000 individual question derivations.

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Concept guide



## [Total expectation with a nonempty null block](/en/derivations/derivation-mko-law-of-total-expectation-01/?from=%2Fen%2Fderivations%2F%3Fq%3Dmko-law-of-total-expectation)

Audit the partition and compute E[X] by two routes.

Law of total expectation

derivation-mko-law-of-total-expectation-01





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