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Find the missing number in the series.

1. 5760, 960, ? , 48, 16, 8

Answer (b). First number is divided by 6 to get the second and the second is divided by 5 to get the third and the third is divided by 4 to get the fourth number and so on.

2. 3, 9, 21, 39, ?

Answer (c). The numbers progressively increase by multiples of 6. Thus, the difference between 9 and 3 is 6, between 21 and 9 is 12, between 39 and 21 is 18. Hence 39 + 24 = 63

3. 1, 0, 3, 2, 5, 6, ?

Answer (d). There are 2 series here. One is 1, 3, 5, 7. The second is 0, 2, 6, 12.

4. 1, 1, 2, 3, 5, 8, 13, ?

Answer (b). Starting from 2, each number is the sum of preceding 2 numbers. Thus 1 + 1 = 2 + 1 = 3 + 2 = 5 + 3 = 8 + 5 = 13 + 8 = 21.