Select the correct combination of mathematical signs to sequentially replace the * signs and balance the given equation.
21 * 3 * 36 * 2 * 23 = 68
1) 21 ÷ 3 – 36 x 2 + 23 = 68 7 – 36 x 2 + 23 7 – 72 + 23 - 42 ≠ 68 2) 21 ÷ 3 x 36 + 2 - 23 = 68 7 x 36 + 2 – 23 252 + 2 – 23 231 ≠ 68 3) 21 + 3 x 36 - 2 ÷ 23 = 68 21 + 3 x 36 – 0.67 = 68 21 + 108 – 0.67 = 68 128.33 ≠ 68 4) 21 x 3 - 36 ÷ 2 + 23 = 68 21 x 3 – 18 + 23 = 68 63 – 18 + 23 = 68 63 + 5 = 68
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