exam Maths Puzzle Numerical Ability

Please give a defined example so that I may understand how in real life where functions are utilized? ASAP

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exam Other Question

Permutation P = n! / (n-r)! or Combination C = n! / (n-r)! r!
n r n r

Can you help me solve:

A quinella bet consist o I am having a hard time trying to solve this equation 9t-8t=7 Please help?