Question

Find the wrong term in the given series 4, 4, 7, 19, 71, 361, 2161

Answer 1

Step-by-step explanation:

firstly after 4

4*1 - 0 = 4 - 0 = 4

After this

4*2 - 1 = 8 - 1 = 7

Now , 7*3 - 2 = 21 - 2 = 19

next , 19*4 - 3 = 76 - 3 = 73

next , 73*5 - 4 = 365 - 4 = 361

in the end , 361*6 - 5 = 2166 - 5 = 2161

But , in the given series -

There is 71 who's the wrong term in the given series.