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प्रश्न
Relationship among MR, AR and ηd is:
विकल्प
`eta_"d" = "AR"/("AR" - "MR")`
ηd = AR – MR
MR = AR = ηd
AR = `"MR"/eta_"d"`
उत्तर
`eta_"d" = "AR"/("AR" - "MR")`
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