1/1×2 +1/2×3+...+1/n= n/n+1 proof by mathematical induction
I need this asap!!​

List the 10 possible samples (without replacement) of size 3 3 that can be obtained from the population of five officials.

The jurassic zoo charges $14 for each adult admission and $5 for each child. the total bill for 77 people from a school trip was $565. how many adults and how many children went to the zoo? i

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys