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What are the next two terms in the following?

6, 11 15, 18, 20, __, __


1. 22, 23
2. 21, 22
3. 21, 21
4. 20, 21

1 Answer

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Best answer
Correct Answer - Option 3 : 21, 21

GIVEN SERIES: 6, 11 15, 18, 20, __, __

PATTERN: 

6 + 5 = 11

11 + 4 = 15

15 + 3 = 18 

18 + 2 = 20 

20 + 1 = 21

21 + 0 = 21

Hence, 21, 21 is correct.

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