Study guides

Q: What number is the next logical number 1 2 3 5 9 12 21?

Write your answer...

Submit

Related questions

21. Add the last 2 numbers to get the next.

21. This is the Fibonacci series.

It is: 34

I think the next number would be 33.

The next two numbers in the sequence are... 45 & 54.

8

75

If the last number is 1/3 (it should be), the next number is 5 and 1/3

My guess: 2.5

8

34. Each number is the sum of the two preceding numbers. This is called the Fibonacci Sequence.

The next composite number after 20 is 21.

21

21 - each number in the series increases by the series 1,2,3,4,5.... Whereby 6 and 7 are separated by 1, 7 and 9 are separated by 2, 9 and 12 are separated by 3, 12 and 16 are separated by 4, so the next in the series would be 21 (16 and 21 are separated by 5).

21 of 12% = 21*0.12 = 2.52

22

It is 43 because 31+12 = 43

The next number in this sequence should be 33.

50. Fit the quadratic Un = 6.5n2 - 16.5n + 12

12. you're doing multiples of 3 and the tens and ones places are just reversed in the writing- 3 6 9 12 15 18 21=3 6 9 21 51 81 12

(21/x) (12/100)= 175

3 is a prime factor of 12 and of 21.

Using the position-to-value rule Un = (17n4 - 190n3 + 721n2 - 1064n + 540)/4 the next number is 276.

There is an infinite number of prime numbers that are greater than 21. The next prime number after 21 is 23.

21 = (.12)(x) 21 / .12 = x Answer: 175