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What number is missing from the sequence?

Things to remember in arithmetic series progression of numbers and how to use the formula.
Practice how to write mathematical expression or equation
Let variable letter "d" - represent the difference between second term and first term.
Let variable letter "n2" - represent the second term in series of number.
Let variable letter "n1" - represent the first term in series of number.
Let variable letter "n" - represent the total number count up to the last missing number.
If the difference between the following number (n2) and the previous number (n1) is the same then you have an arithmetic progression. Remember first term n1 is always variable letter "a" when you read standard textbook formula for arithmetic progression
Let variable letter "L" - represent the last term in series of number.
Let variable letter "s" - represent the sum of arithmetic series progression up to the last number.
Procedure on how to find the last term "L" in arithmetic series progression by using the discovered formula or recipe.
Step 1. Enter the given numerical value of position "n2", for example n2 = 4
Step 2. Enter the given numerical value of position "n1", for example n1 = 0
automation was used to save time to compute the difference, "d" = 4
automation was used to save time to enter the value of an1 or a, "a" = 0
Step 3. Count the total number up to the last missing term, for example total number, n = 4
automation was used to save time to compute the missing last term, "L" = 12
automation was used to save time to compute the total sum of arithmetic series up to the last term, "s" = 24
Practice