book Maths Puzzle Numerical Ability

i need to know how to draw a step function for f(x)=[3x-1]!!!

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book Other Question

let V1, V2, V3, and V4 be a basis of a four-dimensional vector space V.
i) Is it true that V1, V2, and V3 span a three-dimensional subspace of V? If so describe that space.
ii) Phil & phyllis are siblings. phyllis has twice as many brothers as she has sisters. phil has the same number of brothers as sisters. how many girls and how many boys?