Question

Find the next number of this number line:
2,4,9,20,40?
​

Answer 1

Answer:

61 Is the answer

Step-by-step explanation:

the explanation is:

2 + 2 = 4

4 + 5 = 9

9 + 11 = 20

20 + 20 = 40

40 + 21 = 61

Answer 2

Answer:

72

Step-by-step explanation:

2,4 diff 2

4,9 diff 5

9,20 diff 11

20,40 diff 20

again 2,5 diff 3

5,11 diff 6

11,20 diff 9

so next diff is to be multiple of 3 ,I.e 12,

first diff is 12+20=32,,

so the final difference is 32+40=72