Which one of the following is not commutative law?

Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.

The given equation has been solved on the basis of a certain rule. Find the correct answer for the unsolved equation on that basis:

Which sequence of mathematical symbols among given sequences must be inserted in place of the (?) in order to obtain the desired result?

12_6_3_8_3

Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.

30 * 4 * 2 * 1 * 121

If ‘P’ means (÷), ‘Q’ means (×), ‘R’ means (+), and ‘S’ means (-), then what is the value of the expression:

If 12 $ 18 = 10, 15 $ 18 = 11 then what is the value of 32 $ 22 = ?

Which two signs should be interchanged to make the given equation correct?

8 – 32 + 20 × 15 ÷ 3 = 271