Question

Write the following sets in the roaster from

(i) A = {x : x ∈ R, 2x + 11 = 15}

(ii) B = {x | x2 = x, x ∈ R}

(iii) C = {x | x is a positive factor of a prime number p}

Answer 1

(i) Given, A = {x : x ∈ R, 2x + 11 = 15}

(ii) B = {x | x² = x, x ∈ R}

(iii) C = {x | x is a positive factor of a prime number p}

Comments

'p' might not be a factor as we don't know whether 'p' is positive or negative .As asked in the question, the factors of 'p' has to be positive.

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abhyudith  p is a prime number and prime numbers cannot be negative they are always positive so yes p and 1 are the two prime factors of p

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Number p is a factor of itself.