Question

18. Question 12.
Which number will replace the question mark (?) so that it will complete the series?
5, 4, 7, 20, (?), 394
ho
Pick ONE option
A) 35
B) 9
C) 79
D) 39​

Answer 1

Step-by-step explanation:

answer c 79

5 x 1 - 1 = 5

4 × 2 - 1 = 7

7 x 3 - 1 = 20

20 x 4 - 1= 79

79 x 5 - 1 = 394