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If P = {1, 2, 3, 4, 5} and P U Q = {1, 2, 3, 4, 5, 6, 7}, list the elements in Q

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MATHS

If P = {1, 2, 3, 4, 5} and P U Q = {1, 2, 3, 4, 5, 6, 7}, list the elements in Q

  • A. {6}
  • B. {5, 7}
  • C. {6, 7}
  • D. {7}

QUICK ANSWER…

C

SOLUTION 

If P = {1, 2, 3, 4, 5} and

P U Q = {1, 2, 3, 4, 5, 6, 7}, then the elements in Q must include 6 and 7

Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is incorrect.
  3. C is correct.
  4. D is not the correct answer.

KEY-POINTS…

You may please note these/this:

  • Elements in Q must include 6 and 7 in other to make the set true.
  • Q will either contain only 6 and 7, or 6, 7, plus any number or numbers in P.

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/ culled from 2015 JAMB-UTME mathematics past question 34 /

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