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Option 3 : + and x
1) + and ÷ → 9 + 3 - 30 × 7 ÷ 6 = 23 ≠15
2) - and + → 9 ÷ 3 + 30 × 7 - 6 = 207 ≠15
3) + and x → 9 ÷ 3 - 30 + 7 × 6 = 15
4) ÷ and x → 9 × 3 - 30 ÷ 7 + 6 = 28.71 ≠15
Hence, interchanging + and × gives the correct equation.
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