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(1/64) of 640 = (1/64) of 64*10 But 1/64 of 64 = 1 So the answer is 1 of 10 which is 10.
Expressed as a decimal, 1/64 is equal to 0.015625
The fourth positive cube number is 4x4x4 which equals the number 64.
the series can be 1,-4,16,-64
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