Set I

Question 1

Formula for Counting the Number of Consecutive Integers:

Answer 1

Last - First + 1

Question 2

Formula for Counting the Number of Consecutive Multiples:

Answer 2

( Last - First ) / Increments + 1

Question 3

Formula for the Sum of Consecutive Integers:

Answer 3

Average * Number of Terms
Average = ( First Term - Last Term ) / 2
Number of Terms = ( Last Term - First Term ) + 1