Answer:
Step-by-step explanation: This is geometric series with first term a1=1 and ratio r=3.
Sum of the first n terms of geometric series is
Sn=a_1 (r^n-1)/(r-1)
Hence sum of the first 20 terms is
S_20=(3^20-1)/(3-1)=(3^20-1)/2 = 1743392200
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Answer:
Step-by-step explanation: This is geometric series with first term a1=1 and ratio r=3.
Sum of the first n terms of geometric series is
Sn=a_1 (r^n-1)/(r-1)
Hence sum of the first 20 terms is
S_20=(3^20-1)/(3-1)=(3^20-1)/2 = 1743392200