Question

if 4,9,20,43,? , what will be the next no.​

Answer 1

Answer:

90

Step-by-step explanation:

See pattern below

4 * 2 + 1 = 9

9 * 2 + 2 = 20

20 * 2 + 3 = 43

43 * 2 + 4 = 90