GMAT Quantitative Reasoning Practice Test 2

Question : 33 of 100

Marks: +1, -0

An Ameba is an organic life form that divides into two Amebas each round hour. If at a certain round hour, two Amebas were placed in a jar, how many Amebas will be in the jar in

N

hours?

$2^N$
$22 {\N}$
$2 N+1$
$2 N-1$
$2 N$

Validate

Solution:

Let's find the number of Amebas in the first hours.
After one hour

(N=1)

there will be 4 Amebas.
After two hours

(N=2)

there will be 8 Amebas.
After three hours

(N=3)

there will be 16 Amebas.
Therefore, the formula that fits this series is

2^{N+1}

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