There's a pattern here on alternate weeks - can you spot it?

Wk2 = Wk1 + £3

Wk3 = Wk2 x 2

Wk4 = Wk3 + £3

Wk5 = Wk4 x 2

Wk6 = Wk5 + £3

Therefore using this pattern for the following weeks, we get:

Wk7 = £58

Wk8 = £61

Wk9 = £122

Wk10 = £125

Wk11 = £250

Wk12 = £253

Wk13 = £506

Wk14 = £509

So therefore Wk14 - Wk 11 is:

£509 - £250 = £259.

Week 14 prize money is worth £259 more than week 11

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