Discussion
Except for the first two numbers, every number in the sequence –1, 3, –3, . . . is the product of the two immediately preceding numbers. How many numbers of this sequence are odd?
*This question is included in Introduction to Nova GRE Math, question #14
| (A) | one |
| (B) | ... |
| (C) | ... |
| (D) | ... |
| (E) | ... |
| (F) | ... |
The solution is
Posted: 04/14/2012 17:50
Why do we stretch the sequence up to 6 terms? I do not seem to see why 6. Is there any indication implied? And if we go to 6, why not stretch to 10?Why did we just stop to -9 (4 terms)
Posted: 04/16/2012 00:43
Moussa, we stop when we have enough to answer the question, which is E, "more than four". Continuing the series doesn't change the answer.
Posted: 08/04/2012 01:01
We're supposed to understand that (is the product of) meant the result of multiplying from the equation? Or is that an expression for multiplying (is the product of)?
Posted: 10/02/2012 19:16
Geo Farah, you are supposed to understand that product in math English means the result of multiplication. Quotient is the result of division.
Posted: 03/01/2013 11:08
Is this sequence
-1,3,-3,-9,27,-243...
means
"-1,3(start)", (-1)×3, 3×(-3), (-3)×(-9), (-9)×27…？
-1,3,-3,-9,27,-243...
means
"-1,3(start)", (-1)×3, 3×(-3), (-3)×(-9), (-9)×27…？
Posted: 03/01/2013 12:51
Yoshi, you just answered your own question.
Posted: 08/24/2013 03:17
why product means multiply？i donot understand！
Posted: 08/24/2013 03:18
ohyes，i find the answer：）
Posted: 08/27/2013 22:01
Really i understand it now. Thanks a lot Pro