Question

Find next number in the sequence 9,11,20,31,51,?

Answer 1

Answer:

Next Number is 82

Step-by-step explanation:

Each number in the series is the sum of preceding 2 numbers

9+11=20  

11+20=31  

20+31=51

so 31+51= 82 is the required answer

Answer 2

Answer:

82

Step-by-step explanation:

add the preceding number each time you go ahead

so 51+31= 82

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