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Find the Indicated Quantity n\mathrm { n } , When a1=309,an=49\mathrm { a } _ { 1 } = 309 , \mathrm { a } _ { \mathrm { n } } = 49

Question 57

Multiple Choice

Find the indicated quantity.
- n\mathrm { n } , when a1=309,an=49\mathrm { a } _ { 1 } = 309 , \mathrm { a } _ { \mathrm { n } } = 49 , and d=−20\mathrm { d } = - 20 ;


A) 13
B) 11
C) 12
D) 14

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