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Can someone tell me what means this formula?, i dont know what means this parentheses whitout a division :(

Can someone tell me what means this formula i dont know what means this parentheses whitout a division class=

Respuesta :

Answer:

Hello:

Step-by-step explanation:

It means 'choose'. I would advise you to search up 'combinatorics' on YT and learn from there because I don't think i can explain it as well as them on them.