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Problem #77 MEDIUM

The Chessboard Squares

Google Apple Combinatorics Math

Problem Statement

A standard chessboard has 64 squares arranged in an 8×8 grid. How many squares in total can be identified on a standard chessboard — counting not just the 64 individual unit squares, but also all possible larger squares formed by combining adjacent cells? Generalise your answer for an n×n grid.

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