Data Analysis Facts

Question 0

Sum of the first n odd numbers. (Ex. 1+3+5+7+9…)

Answer 0

n^2

Question 1

Sum of the first n positive integers. (Ex. 1+2+3+4+5…)

Answer 1

n(n+1)/2

Question 2

List the single digit prime numbers.

Answer 2

2, 3, 5, 7

Question 3

List the double digit primes that are less than 20. (of the form: 1*)

Answer 3

11, 13, 17, 19