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3 years ago

8

The first row of a conference hall has 8 chairs and 2 additional chairs in each subsequent row. How many chairs are in the 9th r

ow? How many chairs in total are in the first 9 rows?

1 answer:

Anna35 [415]3 years ago

4 0

Ans:

24 chairs in 9th row and 144 chairs in ist 9th rows

Step-by-step explanation:

ist row= 8

2nd = 10

3rd = 12

.

.

.

9th row = 24

and if we add all chairs = 8+10+12+14+16+18+20+22+24= 144

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Answer:

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Then $X\cap Y$ is the number of customer purchased both coffee and donuts

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<em><u>The Number of customers purchased only Coffee:</u></em>

Number of customers purchased only donuts =n(X -Y)

$n( X -Y) = n(X) - n(X \cap Y)$

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n(Y - X) = 43

<em><u>The Number of customers purchased only donuts:</u></em>

Number of customers purchased only donuts =n(Y -X)

$n(Y - X) = n(Y) - n(X \cap Y)$

n(Y - X) = 39 -16

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<u>The Number of customers did not purchase either of these items:</u>

Number of customers did not purchase either of these items = $n(X\cup Y)^{\prime}$

First lets find $n(X\cup Y)$

$n(X\cup Y) = n(X) + n(Y) - n( X \cap Y)$

$n(X\cup Y) = 59 + 39 - 16$

$n(X\cup Y) = 82$

$n(X\cup Y)^{\prime}$ = $110 - n(X\cup Y)$ = 28

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Step-by-step explanation:

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Step-by-step explanation:

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