Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
45 * 9 * 3 * 7 * 5 * 21
1
÷, +, × , -, =
2
-, ÷, +, × , =
3
× , +, ÷, -, =
4
-, +, × , ÷, =
Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
45 * 9 * 3 * 7 * 5 * 21