Select the number that does not belong to the following group. 1, 1, 1.5, 3, 7.5, 22.5, 78.75, 310
310
Each term is the previous term multiplied by a factor that increases by 0.5 each time.
1 × 1 = 1
1 × 1.5 = 1.5
1.5 × 2 = 3
3 × 2.5 = 7.5
7.5 × 3 = 22.5
22.5 × 3.5 = 78.75
78.75 × 4 = 315
The last term should be 315, but 310 is given, so 310 does not belong.
Hence, 310.
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