Grade 8 Reasoning: Number series

1. 1.B) 73Add 10 each time.
2. 2.C) 203Multiply by 3 and subtract 1 each time.
3. 3.B) 66The differences are -32, -8, -2. Each difference is divided by 4.
4. 4.C) 339Multiply by 3, then subtract 10, and repeat.
5. 5.A) 22Add 3 each time.
6. 6.C) 77Multiply by 2 and add 3 each time.
7. 7.C) 78Multiply by 2, then add 7, and repeat.
8. 8.D) 88The differences are -32, -8, -2. Each difference is divided by 4.
9. 9.A) 57Add 10 each time.
10. 10.A) 81Add 4, then 16, then 64 (×4 each gap).

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