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_+_+_=30 (1,3,5,7,9,11,13,15)

Sagot :

I get it! 10 + 10 + 10 = 30 then.. the excess numbers  (1,3,5,7,9,11,13,15) are FACTORS

Its Parenthesis

 Exponents

Multiplication

Division

Addition

Subtration