I want to know about

What is its name ? And what is its uses ? Anyone tell me, please

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It’s the capital pi in Greek. It’s called product. It’s similar to summation but instead of adding the numbers you multiply them. For example,

{isplaystyle rod {i=m}^{n}x{i}=x_{m}dot x_{m+1}dot x_{m+2}dot dots dot x_{n-1}dot x_{n},}