# Posts by Robo123

Total # Posts: 10

**Binomial Coefficient**

Evaluate: n n-2 (expression should be in large brackets) I got n! /n-2! 2! . I know this is wrong but am not sure what to do next.

*December 12, 2010*

**Binomial Coefficients**

Evaulate: n n-2 (expression should be in large brackets) I got n! /n-2! 2! . I know this is wrong but am not sure what to do next.

*December 11, 2010*

**Word Problem - Check Answer (geometric Seq)**

1) Suppose five people are ill during the first week of an epidemic and that each person who is ill spreads the disease to four people by the end of the next week. By the end of the tenth week of the epidemic, how many people have been effected by the illness? A - 1477625 b - ...

*December 11, 2010*

**Math (sequence)**

Find the first four terms of each sequence. A1= 2 A2=5 An=An-1 + An-2, n≥3

*December 11, 2010*

**Geometric series - Check my answer**

What is the first term in a geometric series with ten terms, a common ratio of 0.5 and a sum of 511.5? I got 256 as my answer. 511.5=a1[1-(.5)^10]/1-1/2 511.5=a1(1023/1024)/1/2 511.5=a1(1023/512) ----> divide by both sides 256=a1

*December 11, 2010*

**Math - Sum of a Series**

Thanks. Mange to figure it out. Got the same answer as you.

*December 11, 2010*

**Math - Sum of a Series**

Find the sum of the series 23 + 18 + 13 + . . .+ (-82) A) -590 B) 590 C) -649 D) 649

*December 11, 2010*

**Math - Geometric Series**

Find the sum of the geometric series 128 - 64 + 32 - . . . to 8 terms. a) 85 b) 225 c) 86 d) 85/2 e) not possible

*December 11, 2010*

**Math/Pre Cal**

Find the sum of the geometric series 128-64+32-______to 8 terms .

*December 10, 2010*

**Math/Pre Cal**

Find the sum of the geometric series 128-64+32-______to 8 terms .

*December 10, 2010*

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