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Using PEDMAS:
2^4 = 16
New expression:
2 - 8 ÷ (16 ÷ 2)
(16 ÷ 2)= 8
New Expression
2 - 8 ÷ 8
8 ÷ 8 = 1
New Expression
2 - 1
2 - 1 = 1