Series Attack

Algebra Level 3

8, 6, 9, 23, 87 , ...

What number should come next?

128 226 324 429

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Manmeswar Patnaik by Manmeswar Patnaik , 22, India

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11 solutions

Manmeswar Patnaik
Nov 19, 2014

8 x 1 - 2 = 6

6 x 2 - 3 = 9

9 x 3 - 4 = 23

23 x 4 - 5 = 87

87 x 5 - 6 = 429 ...and so on

46 Helpful 0 Interesting 0 Brilliant 0 Confused

got it..thnx

Mohmmad Tayyab Khan - 6 years, 6 months ago
Nirbak Balok
Nov 24, 2014

429, because : 8 x 1 - 2 = 6

6 x 2 - 3 = 9

9 x 3 - 4 = 23

23 x 4 - 5 = 87

87 x 5 - 6 = 429

3 Helpful 0 Interesting 0 Brilliant 0 Confused
Jamil Osman
Nov 24, 2014

8 x 1 - 2 = 6 6 x 2 - 3 = 9 9 x 3 - 4 = 23 23 x 4 - 5 = 87 87 x 5 - 6 = 429

3 Helpful 0 Interesting 0 Brilliant 0 Confused
Siva Gonam
Nov 25, 2014

8 x 1 -2 = 6 6 x 2 - 3 = 9 9 x 3 - 4 = 23 23 x 4 - 5 = 87 87 x 5 - 6 = 429 .....

2 Helpful 0 Interesting 0 Brilliant 0 Confused

8 x 1 - 2 = 6

6 x 2 - 3 = 9

9 x 3 - 4 = 23

23 x 4 - 5 = 87

87 x 5 - 6 = 429

2 Helpful 0 Interesting 0 Brilliant 0 Confused
Hadia Qadir
Jul 28, 2015

8 x 1 - 2 = 6 6 x 2 - 3 = 9 9 x 3 - 4 = 23 23 x 4 - 5 = 87 87 x 5 - 6 = 429 ...and so on

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Lucas Spencers
May 11, 2015

Sweet mother of series that was a tough one to hit suddenly...

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Hahaha..................Well said. I also took a bit time to get it..

Manmeswar Patnaik - 6 years, 1 month ago

It's just:

N×Un-(Un+1)= U(n+1), Where U(n+1) is the next number in sequence.

E.g. N=6, Un=2. 6×2-(2+1)= 12-3=9 => U3= 9

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Pawan Kumar
Nov 27, 2014

(8-1) x 1 - 1 = 6

(6-1) x 2 - 1 = 9

(9-1) x 3 - 1 = 23

(23-1) x 4 - 1= 87

(87-1) x 5 - 1 = 429

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Anna Anant
Nov 26, 2014

429, because : 8 x 1 - 2 = 6 6 x 2 - 3 = 9 9 x 3 - 4 = 23 23 x 4 - 5 = 87 87 x 5 - 6 = 429

1 Helpful 0 Interesting 0 Brilliant 0 Confused
Sardar Ali
Nov 25, 2014

8 x 1 - 2 = 6

6 x 2 - 3 = 9

9 x 3 - 4 = 23

23 x 4 - 5 = 87

87 x 5 - 6 = 429

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Wow. That was hard.

Kushagra Agrawal - 6 years, 1 month ago

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