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jmc

prealgebra junior

Problem

The Incredible Hulk can double the distance he jumps with each succeeding jump. If his first jump is 1 meter, the second jump is 2 meters, the third jump is 4 meters, and so on, then on which jump will he first be able to jump more than 1 kilometer (1,000 meters)?
(A)
(B)
(C)
(D)
Solution
This is a geometric sequence in which the common ratio is 2. To find the jump that would be over a 1000 meters, we note that . However, because the first term is and not , the solution to the problem is
Final answer
C