Which entry must be removed so that all lines are identical? 88888888 88888888 8675309 8675309 1001011 1001011 6172876903 6172879603

1/4 + 1/8 + 2/16 =

Light A and light B are always in opposite on-off states to each other. Light C is always opposite light A. Light D is only on if both light A and light C are on, otherwise it is off. What can be said about these four lights?

Where should parentheses be added to make the following expression true? 1 ÷ 1 + 1 + 1 + 1 ÷ 1 + 1 + 1 + 1 ÷ 1 + 1 + 1 = 1

Solve for x: y(x - 1) = z

((7 * 9) - 1) * 2 + 1 =

Where should parentheses be added to make the following expression true? 100 ÷ 25 - 5 + 8 = 13

Where should parentheses be added to make the following expression true? 1 + 1 + 1 * 2 + 3 + 1 = 10

1/4 + 6/8 =

Complete the series: 1, 2, 4, 8, 16, 32, ...

Complete the series: a, bb, ccc, ...