Question

Consider A = {2x + 1: 5 $\le$ x $\le$ 10 and x $\in$ I} and B = { 2x - 3 : 5 $\le$ x $\le$ 10 and x $\in$ I}. Find A $\Delta$ B

• A. {7, 9, 11, 13, 15, 17, 19, 21}
• B. {}
• C. {11, 13, 15, 17}
• D. {7, 9, 19, 21}

Answer 1

The correct option is D {7, 9, 19, 21}

A = {11, 13, 15, 17, 19, 21}

B = {7, 9, 11, 13, 15, 17}

A$\Delta$B = (A $\cup$ B) – (A$\cap$B)

A $\cup$B = {7, 9, 11, 13, 15, 17, 19, 21}

A$\cap$B = {11, 13, 15, 17}

A$\Delta$B = {7, 9, 19, 21}