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10 Jul 2020, 04:36
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M is the set of positive and negative integers that are multiples of 5. M = ( ...... -15. -10. -5. 0. 5. 10. 15 ...... ). Integers A and B are members of set M. Which of the following expression is NOT a member of set M?
A. AB
B. A/B
C. A + B
D. A^2 + B^2
E. A - B
A. AB
B. A/B
C. A + B
D. A^2 + B^2
E. A - B
10 Jul 2020, 04:43
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(B) . Assuming the integers are A and B(not 8).
Solved by quickly putting some values for A and B. Consider A = 5 and B = 15. A/B = 5/15 = 1/3 = 0.33, which is not an integer. Therefore, expression A/B doesn't belong to set M.
Solved by quickly putting some values for A and B. Consider A = 5 and B = 15. A/B = 5/15 = 1/3 = 0.33, which is not an integer. Therefore, expression A/B doesn't belong to set M.
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10 Jul 2020, 04:44
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Let A is 5X and B be 5Y
Putting value in options
A. AB = 5x*5y = 25xy (Part of set M)
B. A/B = 5x/5y = X/Y (can or can't be a part of set M)
C. A + B = 5x+5y = 5(x+y) (part of set M)
D. A^2 + B^2 = 25x^2 + 25y^2 (part of set M)
E. A - B = 5X-5Y = 5(x-y) (part of set M)
Answer is B
Posted from my mobile device
Putting value in options
A. AB = 5x*5y = 25xy (Part of set M)
B. A/B = 5x/5y = X/Y (can or can't be a part of set M)
C. A + B = 5x+5y = 5(x+y) (part of set M)
D. A^2 + B^2 = 25x^2 + 25y^2 (part of set M)
E. A - B = 5X-5Y = 5(x-y) (part of set M)
Answer is B
Posted from my mobile device
