Sunday, August 6, 2017

Pattern Recognition - 163

Find out the next two numbers in the series.
2 ,  5 ,   18 ,  87 , _ , _ , ............................


Answer

2 ,  5 ,   18 ,  87 , _ , _ , ............................

Tn  = [Tn-1 * (n+1)]  - (n-1)

T2  = [T1 * (2+1)]  - (2-1) = 2 * 3  -1 = 5

T3  = [T2 * (3+1)]  - (3-1) = 5 * 4  -2 = 18

T4  = [T3 * (4+1)]  - (4-1) = 18 * 5  -3 = 87

T5  = [T4 * (5+1)]  - (5-1) = 87 * 6  -4 = 518

T6  = [T3 * (6+1)]  - (6-1) = 518 * 7 -5 = 3621



2 ,  5 ,   18 ,  87 ,  518 ,  3621 , ............................

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