3. How many solutions does the equation ₁+ ₂+ 3+₁ = 20 have, if 21, 22, 23, 24 are each required to be positive integers?

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Chapter2: Second-order Linear Odes
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3. How many solutions does the equation
₁+₂+3+4= 20
have, if 71, 72, 73, 74 are each required to be positive integers?
Transcribed Image Text:3. How many solutions does the equation ₁+₂+3+4= 20 have, if 71, 72, 73, 74 are each required to be positive integers?
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