# Six speeds

A drilling machine is to have 6 speeds ranging from 50 to 750 revolutions per minute. If the speed forms a geometric progression, determine their values.

a1 =  50 rpm
a2 =  85.9386 rpm
a3 =  147.7088 rpm
a4 =  253.8778 rpm
a5 =  436.3581 rpm
a6 =  750 rpm

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