3, 6, 18, 72, _
Correct answer: D. 360
- A. 144
- B. 216
- C. 288
- D. 360
Explanation
The pattern is: Times 2, Then times 3, Then times 4, So times 5 to get 360 From 3 to 6: Multiply by 2 (3×2=6)From 6 to 18: Multiply by 3 (6×3=18)From 18 to 72: Multiply by 4 (18×4=72)It appears that each number is obtained by multiplying the previous number by successive integers: 2, 3, 4, ...Therefore, the next number in the sequence should be obtained by multiplying 72 by 5:72×5=360
This question appeared on the NUMS 2014 paper, which you can sit online with every answer explained.
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