What is the next number 0 3 9 21?

Answer 1

45. 0x2=0+3=3

3x2=6+3=9

9x2=18+3=21

21x2=42+3=45

Answer 2

The pattern in the sequence 0, 3, 9, 21 involves adding consecutive odd numbers. Starting with 0, then adding 1+2, 3+6, and 9+12 gives you the next number in the sequence. Therefore, the next number would be 21 + 15 = 36.

Answer 3

Oh, dude, it's like a party trick, right? The next number is 39. You just add the previous number and then multiply by 3. It's like math, but funnier.

Answer 4

What is the next number in the sequence 3,8,18,38