Question

Find the series 5, 4 ,7 , 20, (?), 394 A) 35 B) 9 C) 79 D)39

Answer 1

Answer:

C)79

Step-by-step explanation:

(5*1)-1 = 4

(4*2)-1 = 7

(7*3)-1 =20

So it will be (20*4)-1 =80-1=79

Answer 2

Given:

A series is given to us 5,4,7,20,?

To Find:

Missing term?

Step-by-step explanation:

• Given series is 5,4,7,20,?.

• We can observe a pattern in above series which is

            term $\times$ n - 1 (where n=1,2,3,4)

Thus, first term = (5 1)-1 = 4

Second term=(4 2)-1 = 7

Third term=(73)-1 =20

So missing term will be (204)-1 =80-1=79

Hence, correct answer is 79.