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1. Fibonacci sequence is 1, 1, 2, 3, 5, 8, 13 What is the difference between the 100th term and the sum of the first 98 terms 2. There are two gears meshing with each other as shown in the figure. A straight line with an arrow is drawn on each gear. At the beginning, the two arrows are just opposite. Then the small wheel rotates clockwise. If the big wheel has 177 teeth, the two arrows meet again after the small wheel rotates
1, it's 1, 2. Why don't we have a picture
Sequence 1,2,4,4, (), 8,64
The answer is 16: 1, 2, 4, 4, (16), 8, 64
The rule is as follows: a (1) = 1, a (2n + 1) = 4A (2n-1) a (2n) = 2 ^ n 1,2,4,4, (16), 8,64
Sequence 1,8,8,4,2,
8
The latter is the last bit of the product of the first two terms 1 × 8 = 8 × 8 = 64 4 × 8 = 32 2 × 4 = 8
Number sequence 1 / 1, 1 / 2, 2 / 2, 1 / 3, 2 / 3, 3 / 3, 1 / 4... How much is the 1001st term?
We need formula and algorithm
Don't make this difficult. If you write this sequence in this way, it will be more helpful to think about it
1/1
1/2 2/2
1/3 2/3 3/3
1/4 2/4 3/4 4/4
1/5 2/5 3/5 4/5 5/5
.
By analogy, the number in the first few lines is the number, and the score in the first few lines is the number. From the first line to the 44th line, there are a total of 1 + 2 +... + 44 = 990 numbers, so you can go to 1001-990 = 11 numbers, so there are 11 numbers in the 45th line, that is 11 / 45
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