Answers

2016-01-07T08:58:49+08:00
21. i think irerecheck ko nlng mamaya.
0
  • Brainly User
2016-01-07T12:45:07+08:00
Use the the arithmetic series to solve for problems like this, especially if there are more terms in a series (such as more than 20 terms).

S_{n} =  \frac{n}{2} (a _{1}+a _{n}  )

Sequence = {first 6 consecutive even whole numbers}
                 = {2, 4, 6, 8, 10, 12}

n = number of terms (items) in the sequence  ⇒  6
a₁ = first term in the sequence  ⇒  2
a _{n} = last term in the sequence  ⇒  12

Solution:
Solve of the sum of the series:

S _{6} = \frac{6}{2} (2+12)

S _{6} = 3 (14)

S _{6} = 42

Then, divide the result by 2 (as required in the problem):
42 ÷ 2 = 21

FINAL ANSWER:  21

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