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Excel MMULT Function Guide

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Basic Functionality: MMULT function multiplies two matrices in Excel worksheet
Result is an array with same number of rows as first matrix
Function syntax: MMULT(array1, array2)
Excel 365 vs Earlier Versions: Excel 365 uses dynamic array function with automatic range expansion
Earlier versions require manual cell selection and CTRL+SHIFT+ENTER
Excel 2003 and earlier limited to 5046 cells (71x71 matrix)
Matrix Multiplication Rules: Matrices must have same number of rows as first matrix
Matrices must have same number of columns as second matrix
Product found by multiplying first row of first column by first column of second
Common Issues: #VALUE! error occurs when matrix dimensions don't match
Single cell selection returns first value in result array
Extra columns cause duplicate results
Extra rows cause #N/A! error in extra cell