Combinations, bad components

**jacob93** · November 23rd 2012, 04:53 AM

Problem: 2012-11-23 at 14:46.png

Attempt: $C^6_1 \cdot 0.05^1 \cdot 0.95^5$

Correct is: 0.2036

**cellae** · November 23rd 2012, 06:15 AM

I honestly can't figure out how they got that answer.

I think your attempt is correct.

**Plato** · November 23rd 2012, 08:01 AM

Originally Posted by jacob93

Problem: 2012-11-23 at 14:46.png
Attempt: $C^6_1 \cdot 0.05^1 \cdot 0.95^5$
Correct is: 0.2036

You did not bother to tell witch one you are trying to do.

a) $\binom{6}{0}(.05)^0(.95)^{6-0}$

b) $\binom{6}{1}(.05)^1(.95)^{6-1}$

c) $\sum\limits_{k = 2}^6 {\binom{6}{k}(.05)^k(.95)^{6-k}}$ or
$1-\left(\binom{6}{0}(.05)^0(.95)^{6-0}+\binom{6}{1}(.05)^1(.95)^{6-1}\right)$

**jacob93** · November 23rd 2012, 08:54 AM

Tried b). Thanks both of you, now I know I'm right.

**FranciscoOlsen** · November 26th 2012, 12:12 AM

I honestly can't figure out how they got that answer.

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