solve this .............. MENTAL ABILITY
Level
pending
find the missing number in the series 336, 210 , 120 , _ , 24 , 6 ,0
68
72
70
60
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1 solution
Divide all number by 6. Then you get:
56, 35, 20, _, 4, 1, 0
Then get differences for each adjacent numbers. Then you get:
21, 15, _, _, 3, 1
Get differences again for each adjacent numbers.
6, _, _, _, 2
Seems familiar. It seemed like it's only subtracting 1 on next number. We fill that up:
6, 5, 4, 3, 2
Now that we have that, solve for the series with 2 blanks. We get:
21, 15, 10, 6, 3, 1
Then for the last series, we get:
56, 35, 20, 10, 4, 1, 0
Now that we know that the we filled 10 on the blank, just multiply it by 6.
Hence we get 60