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  1. H

    Tricks in permutation and cominations

    I am about to start this topic, so i was wondering if there was any tips, tricks, or anything in general to lookout for
  2. H

    Permutation and combinations, confusing question

    How many ways can you make change for 50 cents using 5, 10 and 20 cent pieces
  3. H

    Find λ for the points X(−1, 0), Y (1, λ) and Z(λ, 2), if angle YXZ = 90◦

    Please help me with this question, i have tried to consider that the two gradients are XY and XZ, because when multiplied it should give -1, but λ cancels when doing so