Arithmetic 7917

The arithmetic sequence is given: Sn = 222, n = 12, a1 = 2. Determine d, a12.

Correct answer:

a12 =  35
d =  3

Step-by-step explanation:

s=222 n=12 a1=2  s = (a1+a12) n/2 a12=2 s/na1=2 222/122=35
a12 = a1 + (n1)d  d=(a12a1)/(n1)=(352)/(121)=3



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