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From E to D (Posted on 2015-04-28) Difficulty: 3 of 5
Easy
3 $ 2 = 15
7 $ 4 = 311
62 $ 13 = 4975
51 $ 43 = ???

Harder:
15 $ 11 = 104
18 $ 7 = 275
62 $ 13 = 3675
24 $ 1 = ???

Difficult:
31 $ 41 = 592
27 $ 18 = 281
16 $ 180 = 339
33 $ 21 = ???

A $ B denotes a function of A and B, unchanged within a section.

See The Solution Submitted by Ady TZIDON    
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Posible solution | Comment 3 of 4 |
Easy:      51 $ 43 = 894
Harder:   24 $ 1 = 575
Difficult:   33 $ 21 = 928

Hope the intended solution to the third series is 928.

The problem would also be interesting with the question for Difficult :
21 $ 33.

Edited on November 18, 2015, 5:38 am
  Posted by armando on 2015-11-18 05:36:59

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