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suppose ? = 10.0v , r1 = 190? , and r2 = 280? . what value...

suppose ? = 10.0v , r1 = 190? , and r2 = 280? . what value of r3 would you select so the battery supplies 23.0mA ? (R1 and R2 are series. R2 and R3 are parallel.)

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