Looking for a children's book - can you help? Published late 70s / early 80s. Black and white cartoons. A bit like The Cartoon Guide to Algebra, but less content. Drawn more in the style of Roz Chast, with a female main character talking to you. Showing my 10 yr old self permutations vs. combinations, and how to derive a formula for the max. number of line intersections in the plane - teaching induction ("do you see a pattern?"). THIS made me interested in mathematics! But what or who was it?

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