Find the Indicated Quantity $\mathrm { n }$ , When $\mathrm { a } _ { 1 } = 309 , \mathrm { a } _ { \mathrm { n } } = 49$

question 57

Multiple Choice

Find the indicated quantity.
- $\mathrm { n }$ , when $\mathrm { a } _ { 1 } = 309 , \mathrm { a } _ { \mathrm { n } } = 49$ , and $\mathrm { d } = - 20$ ;

• A) 13
• B) 11
• C) 12
• D) 14

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Definitions:

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