Answers

  • Brainly User
2016-07-02T23:22:07+08:00
S _{n}= \frac{n}{2} (a _{1}+a _{n} )

Where:
S _{n} = sum of the series/terms

 a_{n} = last term

n = number of elements in the series

a₁ = first term

Integers between 1 and 101:  2, 3,, 4, ..., 100

n = 99

an = 100

a₁ = 2

Solution:
S₉₉ = 99/2 (2 + 100)

S₉₉ = 99/2 (102)

S₉₉ = 99 (51)

S₉₉ = 5,049

ANSWER:  5,049
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