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Find the sum of the first four terms of the geometric sequence with first term of 20 and common ratio of 3.

Sagot :

Answer:

800

Step-by-step explanation:

i. find the first four terms,

multiply 20 by 3, multiply the product by 3 and continue

20 × 3 = 60 second term

60 × 3 = 180 third term

180 × 3 = 540 fourth term

20, 60, 180, 540, ...

ii. add the four terms,

20+60+180+540 = 800