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OpenStudy (anonymous):
40,20,10,5. what is the equation for this sequence
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OpenStudy (the_fizicx99):
It's geometric because the ratio is 2 a_1 is 40 So, a_n = 40 * r^n-1
OpenStudy (the_fizicx99):
a_n = 40 * 2^n-1
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