GMAT Challenge Question

This week we have another GMAT problem solving question from PrepForTests. This time it’s on exponents.

What is the sum of the 20th and 21st terms in the sequence 1, 3, 9, 27… where each term is 3 times the preceding term?

1. 4 x 3^19
2. 10 x 3^19
3. 4 x 3^20
4. 10 x 3^20
5. 3^39

Check your answer.

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