sallykakoti

Thank you!

For each positive integer n, the nth term of the sequence S is 1 + (-1)n Quantity A: The sum of the first 39 terms of S Quantity B: 39 I keep getting A = 40. 1 + (-1)^0 = 2 1 + (-1)^1= 0 1 + (-1)^2= 2 1 + (-1)^3= 0 and so on...so term 1 + (-1)^39 = 0 and the sum of the first 39 terms is 1 + (-1)^38 = 2 so the sum from 0 to 38 = 40, so B is greater. EXCEPT the answer is A. Can anyone explain my error? Thanks.

Thank you!

I'm not sure I understand the concept of this question: There is a figure of the normal distribution labeled with the mean and standard deviations. The figure shows a normal distribution with mean m and standard deviation, including approximate percents of the distribution corresponding to the six regions shown. Suppose the heights of a population of 3,000 adult penguins are approximately normally distributed with a mean of 65 centimeters and a standard deviation of 5 centimeters. (b) If an adult penguin is chosen at random from the population,approximately what is the probability that the penguin’s height will be less than 60 centimeters? Give your answer to the nearest 0.05. I got 0.16, and the answer is 0.15.

For question #17 in the GRE Official Guide, under the Data Analysis exercises: For 2001, private school expenditures were approximately what percent of total expenditures? A chart is given that displays $30 billion was private expenditures and $160 billion was total expenditures. So I took $30 is x% of $160 or 30/160 = 18.75%. The answer should be 19%. There's no instructions to round up so I can't figure out what I'm doing wrong?

Thank you!

When the positive integer n is divided by 3, the remainder is 2 and when n is divided by 5, the remainder is 1. What is the least possible value of n? My question: How can you set this problem up? Thanks!