Q: What is the next number in the series 3 6 9 15 21?

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The next number is -21

The next number in the sequence 3-15-6-30-21 is -207.

291

21: (3)+3=(6)+4=(10)+5=(15)+6=(21)

It is: 21

Related questions

The next number is -21

28

15

55

The next number in the sequence 3-15-6-30-21 is -207.

21

24

291

the answer will be 21

24

21: (3)+3=(6)+4=(10)+5=(15)+6=(21)

It is: 21