- I have learned that 1 0 is infinity, why isnt it minus infinity?
92 The other comments are correct: 10 1 0 is undefined Similarly, the limit of 1 x 1 x as x x approaches 0 0 is also undefined However, if you take the limit of 1 x 1 x as x x approaches zero from the left or from the right, you get negative and positive infinity respectively
- what is 1 - 1 2 + 1 3 - 1 4 + 1 5 - 1 6 + 1 7 - 1 8 +1 9
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- Binomial expansion of $ (1-x)^n$ - Mathematics Stack Exchange
I'm not sure how appropriate it is to answer questions this old, but compared to the methods above, I feel the easiest way to see the answer to this question is to take a = -x And substitute that into the binomial expansion: (1+a)^n This yields exactly the ordinary expansion Then, by substituting -x for a, we see that the solution is simply the ordinary binomial expansion with alternating
- 为什么 1 不能被认为是质数？ - 知乎
质数就是“只能被1和它本身整除”的自然数。 然而，我们必须在此基础之上增加一条警告，宣称数字1不是质数，这简直就像马后炮一样。
- How can 1+1=3 be possible? - Mathematics Stack Exchange
So that's the "proof" The failure is at step 5, where you say that pq = pr p q = p r implies that q = r q = r; that's true only if you know p p is nonzero For instance 0 ⋅ 5 = 0 ⋅ 7 0 ⋅ 5 = 0 ⋅ 7, but that doesn't let you conclude that 5 = 7 5 = 7, because 0 0 has no multiplicative inverse In your case, the number b − a b − a is playing the role of p p, and because b b and a a
- Given a 95% confidence interval why are we using 1. 96 and not 1. 64?
1 Two reasons: 1) Students are in New Jersey 2) the z z -value associated with 95% is z=1 96; this can be seen as part of the 1-2-3, 65-95-99 rule that tells you that values within p m1−, 2 − or3 p m 1 −, 2 − o r 3 - deviations from the mean comprise 65- 95- or 99% of all values in the distribution Or look it up in a table
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