Que: Suppose P(h) is a group of permutations and identity permutation(id) belongs to P(c). If ϕ(c)=c then which of the following is true?

a. ϕ∈P(h)
b. ϕ⁻¹∈P(h)
c. ϕ⁻²∈P(h)
d. None of the mentioned
Answer: ϕ⁻¹∈P(h)

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