Mark the wrong number in the series:
7.5 47.5 87.5 157.5 247.5 357.5 487.5

357.5

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87.5

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157.5

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7.5

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47.5

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Solution

The correct option is E 47.5

Right number = 7.5 + 30 = 37.5
So, wrong number = 47.5

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