Number series in Math

If the tribes of a sequence are summed up then a series will be formed.

For example:
Row of natural numbers 1, 2, 3, 4, ... the series of the original numbers is: 1 + 2 + 3 + 4 + ....

To say the sum of a series is usually denoted by the letter S. Suppose:
The first two tribes are denoted by S₂.

Example of Number series

Please determine the first 2 tribes of 1 + 5 + 9 + 13 + ...!

Answer
S₂ = 1 + 5
S₂ = 6

So the first 2 tribes of 1 + 5 + 9 + 13 + ... are 6.

Similarly this article.
Sorry if there is a wrong word.
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Referensi :

• To'Ali's book math group accounting and sales

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