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Last Updated on May 10, 2023
GMAT OFFICIAL GUIDE PS
Solution:
We are starting with 3 animals, and at the end of each month that number of animals doubles in size. Thus, we can say:
starting number of animals = 3
number of animals at the end of month 1 = 3 x 2 = 3 x 2^1
number of animals at the end of month 2 = 3 x 2 x 2 = 3 x 2^2
number of animals at the end of month 3 = 3 x 2 x 2 x 2 = 3 x 2^3
Notice that the exponent attached to the base of 2 corresponds with the month number. Thus, after 10 months there will be 3 x 2^10 animals.
Answer: D
