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Coefficient of coupling from the mutual inductance and the two self-inductances

The same question, asked 3 times: 16 May 2023 S1*, 9 May 2024 S2*, 17 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    16 May 2023 S1

    26
    The mutual inductance of two coils is 45 mH. The self-inductance of the coils are L1=75L_1 = 75 mH and L2=48L_2 = 48 mH. The coefficient of coupling between the two coils is

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  2. Question 2

    9 May 2024 S2

    19
    The mutual inductance (M) of the two coils is 3 H. The self inductances of the coils are 4 H and 9 H respectively. The coefficient of coupling between the coils is

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  3. Question 3

    17 Apr 2026 S2

    135
    Two coils having self-inductance L1=75L_1 = 75 mH and L2=48L_2 = 48 mH are coupled with each other. If the mutual inductance of the coils is 37.2 mH, then coefficient of coupling will be

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