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Answer: **225**

In this series, the numbers are **squares**.

- 11 x 11 =
**121** - 12 x 12 =
**144** - 13 x 13 =
**169** - 14 x 14 =
**196**

The next number in the series would be 15 x 15 = **225**.

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Make money from home during lockdown. Average payout is around £200.