The next number in the sequence 3-15-6-30-21 is -207.
The answer is 75. Starting at 10 the sequence is times 3, divided by 2, plus 1, times 3, divided by 2, plus 1. So the next number is times 3 = 75.
28
Times 3, cut in half, plus 1. The next number is 75.
63, 102, 165...
The next answer in the sequence is 75 The sequence is times 3, divided by 2, plus 1 Example 10*3=30 30/2=15 15+1=16 16*3=48 48/2=24 24+1=25 25*3=75
The next number in the sequence 3-15-6-30-21 is -207.
The answer is 75. Starting at 10 the sequence is times 3, divided by 2, plus 1, times 3, divided by 2, plus 1. So the next number is times 3 = 75.
14
15 since you multiply by 3 then subtract 3 in sequence
28
The sequence subtracts consecutive odd numbers. In this sequence it goes -1, -3, -5, -7. The next number will be 75 (84 - 9).
This sequence appears to follow the relation *3, /2 , +1, *3, /2, +1,........ By applying the above relation to the existing numbers we see that 24 + 1 = 25. Hence we apply the *3 logic to 25. We obtain 25 * 3 = 75 as the next number in the sequence.
Times 3, cut in half, plus 1. The next number is 75.
The next number in the sequence is 48.
63, 102, 165...
17