Mathematical operation and symbol notation


Direction: In the following questions, which one of the four interchanges in signs and numbers would make the given equation correct?

  1. (3 ÷ 4) + 2 = 2
    1. + and ÷, 2 and 4
    2. + and -, 3 and 4
    3. + and ÷, 2 and 3
    4. None of the above

  1. View Hint View Answer Discuss in Forum

    On interchanging signs '+' to '÷' and 2 to 3
    (2 + 4) ÷ 3 = 2
    ⇒ 6 ÷ 3 = 2 ⇒ 2 = 2

    Correct Option: C

    On interchanging signs '+' to '÷' and 2 to 3
    (2 + 4) ÷ 3 = 2
    ⇒ 6 ÷ 3 = 2 ⇒ 2 = 2


  1. (6 ÷ 2) x 3 = 0
    1. x to -, 2 and 6
    2. ÷ and x, 2 and 3
    3. x to -, 2 and 3
    4. ÷ and x, 2 and 6

  1. View Hint View Answer Discuss in Forum

    On interchanging signs 'x' to '-' and 2 to 3
    (6 ÷ 3) - 2 = 0
    ⇒ 2 - 2 = 0
    ⇒ 0 = 0

    Correct Option: C

    On interchanging signs 'x' to '-' and 2 to 3
    (6 ÷ 3) - 2 = 0
    ⇒ 2 - 2 = 0
    ⇒ 0 = 0



Direction: Study the following information carefully and answer the given questions. If '+' is coded as 'π' , 'x' is coded as '≠' , '÷' is coded as '$' and '-' is coded as Δ, then what is the value of the following ?

  1. 2 ≠ 7 Δ 4
    1. 9
    2. 3
    3. 13
    4. 10

  1. View Hint View Answer Discuss in Forum

    Given, 2 ≠ 7 Δ 4
    After interchanging the signs,
    2 x 7 - 4
    Apply the BODMAS Rule

    Correct Option: D

    Given, 2 ≠ 7 Δ 4
    After interchanging the signs,
    2 x 7 - 4
    Apply the BODMAS Rule
    2 x 7 - 4 = 14 - 4 = 10.


  1. 17 ≠ 12 $ 3
    1. 98
    2. 87
    3. 75
    4. 68

  1. View Hint View Answer Discuss in Forum

    Given, 17 ≠ 12 $ 3
    After interchanging the sign,
    17 x 12 ÷ 3
    Apply the BODMAS Rule.

    Correct Option: D

    Given, 17 ≠ 12 $ 3
    After interchanging the sign,
    17 x 12 ÷ 3
    Apply the BODMAS Rule
    = 17 x 4 = 68



  1. 72 π 27 Δ 99
    1. 65
    2. 52
    3. 47
    4. 0

  1. View Hint View Answer Discuss in Forum

    72 π 27 Δ 99
    After interchanging the signs,
    72 + 27 - 99
    Apply the BODMAS Rule.

    Correct Option: D

    72 π 27 Δ 99
    After interchanging the signs,
    72 + 27 - 99
    Apply the BODMAS Rule.
    = 99 - 99 = 0