Instructions: In each of these questions a number series is given. In each series only one number is wrong. Find out the wrong number.
157.5 45 15 6 3 2 1
157.5 ÷ 3.5 = 45
45 ÷ 3 = 15
15 ÷ 2.5 = 6
6 ÷ 2 = 3
3 ÷ 1.5 = 2
2 ÷ 1 = 2 ≠ 1
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