Observe the pattern, and help Ema find the next number in the series.

207

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218

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165

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183

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Solution

The correct option is B 218
Looking closely at the numbers, we find:
12
$25 = 12 \times 2 + 1$
$52 = 25 \times 2 + 2$
$107 = 52 \times 2 + 3$

Therefore, the next number should be
$107 \times 2 + 4$
$= 214 + 4$
$= 218$

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