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3. Find the sum of the first 34 terms of the arithmetic sequence 1,5,9,13,17,...

Sagot :

Answer:

a1: 1 d: 4 an: 34

an=a1+(n-1)d

a34= 1+(34-1)(4)

a34= 1+(33)(4)

a34= 1+132= 133

a34=133

Hope it helps....