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3 years ago

A. 6 b. 10 c. 7 d. 9

Mathematics

2 answers:

Juli2301 [7.4K]3 years ago

6 0

Answer:

Step-by-step explanation:

21-20 = 1

20-18 =2

18 -15 = 3

15-11 = 4

We are subtracting 1 more each time

11-5 = 6

Ostrovityanka [42]3 years ago

4 0

I think 6 is the answer
Hope its help for your questions

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