find the next number 4,9,17,28,42,?​
give me the explanation

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1. Answer:

   59

   Step-by-step explanation:

   9-4 = 5

   17-9 = 8

   28-17= 11

   42-28= 14

   5+3 =8

   8+3= 11

   11+3=14

   14+3 = 17

   ∴ 42 + 17 = 59

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