Question

4 18 78 294 858 explain this series

Answer 1

Answer:

1686

Next number is the last number multiplied by (7 - last number position) - 6* last number position

Step-by-step explanation:

4 18 78 294 858 explain this series

4

4 * 6  - 6 = 18

18* 5 - 12 =  78

78*4  - 18 =  294

293 * 3 - 24 =  858

858*2 - 30 =  1686

so next number would be 1686

Next number is the last number multiplied by (7 - last number position) - 6* last number position

1st Number = 4   => position = 1

=> 2nd number = 4 * ( 7 -1)  - 6*1 = 18

2nd number = 18  , position = 2

= > 3rd number = 18 * ( 7 -2) - 6*2 = 78

and so on

Answer 2

Step-by-step explanation:

This series 4 18 78 294 858 is a combinational series of multiplication and subtraction.

Lets work to find out the logic behind the series.

First consider either last two terms or first two terms. Let us take first 2 terms

4 18---- We need to find how to make 4 as 18

If we multiply 4 by  6 we get 24, now to make it 18 subtract 6.

Hence we got a formula like first we need to multiply then subtract.

4 18 ---- 4*6 - 6*1 = 18

18 78 ------ 18*5 - 6*2 = 78

78 294 ----- 78*4 - 6*3 = 294

294 858 ----- 294*3 - 6*4 = 858