Answer:
21.
Sequence: 3, 6, 12, 24, 48, 96, 192, 384, 768...
5th value: 48
The sum of all numbers up through the 5th: 93
22.
Sequence: 2, 6, 18, 54, 162, 486, 1458, 4374, 13122...
4th value: 54
The sum of all numbers up through the 4th: 80
23.
Sequence: 4, -8, 16, -32, 64, -128, 256, -512, 1024...
6th value: -128
The sum of all numbers up through the 6th: -84
24. Common Ration (r) : 2
Sequence: 11, 22, 44, 88, 176, 352, 704, 1408, 2816...
4th value: 88
The sum of all numbers up through the 4th: 165
25. Common Ration (r) : 2
Sequence: 2, 4, 8, 16, 32, 64, 128, 256, 512
4th value: 16
The sum of all numbers up through the 4th: 30
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Answers & Comments
Answer:
21.
Sequence: 3, 6, 12, 24, 48, 96, 192, 384, 768...
5th value: 48
The sum of all numbers up through the 5th: 93
22.
Sequence: 2, 6, 18, 54, 162, 486, 1458, 4374, 13122...
4th value: 54
The sum of all numbers up through the 4th: 80
23.
Sequence: 4, -8, 16, -32, 64, -128, 256, -512, 1024...
6th value: -128
The sum of all numbers up through the 6th: -84
24. Common Ration (r) : 2
Sequence: 11, 22, 44, 88, 176, 352, 704, 1408, 2816...
4th value: 88
The sum of all numbers up through the 4th: 165
25. Common Ration (r) : 2
Sequence: 2, 4, 8, 16, 32, 64, 128, 256, 512
4th value: 16
The sum of all numbers up through the 4th: 30