When two resistance R 1 and R 2 connected in series and introduced into the left gap of a meter bridge and a resistance of 10 Ω Ω is introduced into the right gap, a null point is found at 60 cm from left side. When R 1 and R 2 are connected in parallel and introduced into the left gap, a resistance of 3 Ω Ω is introduced into the right-gap to get null point at 40 cm from left end. The product of R 1 R 2 is_____ Ω Ω 2
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