The Formula for the Sum of the First N Terms $\frac { n \left( a _ { 1 } - a _ { n } \right) } { 2 }$

question 88

Multiple Choice

The formula for the sum of the first n terms of an arithmetic sequence is _______.

• A) \(\frac { n \left( a _ { 1 } - a _ { n } \right) } { 2 }\)
• B) \(\frac { n \left( a _ { 1 } + a _ { n - 1 } \right) } { 2 }\)
• C) \(a _ { 1 } + ( n - 1 ) d\)
• D) \(\frac { n \left( a _ { 1 } + a _ { n } \right) } { 2 }\)

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