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Missing Number in the Sequence

Explain your answer

What number is missing from the sequence?

Things to remember in arithmetic progression. Start by computing the difference between the second number and the first number. d = n2 - n1. If the difference between the following number and the previous number is the same then you have an arithmetic progression. First term n1 is always "a".



Automated formula for arithmetic progression.

Step 1. Count the number up to the missing number. The number of count is represented by variable letter n = 4. Go down below in automated formula and practice entering 4 in white input box. Blue button number means automatic calculation.



Step 2. The first number in arithmetic series equation to compute the last missing number is represented by variable letter "a" which is also represented by n1 count position. So a = n1 = 0. Again practice entering 0 in white input box.



Step 3. The second number in arithmetic series is represented by variable letter n2. Practice entering n2 = 4 in white input box.



Step 4. The last missing number at position n4 is now predicted or calculated. The last missing number is represented by the variable letter "L". L = 12



Step 5. If you want to add all the numbers from the starting number up to the last missing number, the recipe or formula for addition or summation is represented by variable letter "s". It is also done automatically. s = 24 it is the addition of arithmetic series of number starting from 0, 4, 8, 12 the last missing number.

With this tutorial you are beginning to understand the arithmetic series equations on how to find the last missing number and the summation up to the last number.



Finally test yourself by answering the practice question below if you can follow the instruction on how to compute the last missing number in arithmetic series.

/ 2

N2

N1

d = difference

Using Co-Pilot

Practice --- Correct answer is 35, 26

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