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The probability that a randomly chosen one-one function from the set {a, b, c, d} to the set {1, 2, 3, 4, 5} satisfies f(a) + 2f(b) – f(c) = f(d) is :

1. 24 1
2. 40 1
3. 30 1
4. 20 1

Correct answer: 20 1

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