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fiasKO [112]
3 years ago
5

Which expression represents the phrase 4 times the sum of 9 and 6

Mathematics
2 answers:
Marta_Voda [28]3 years ago
6 0
4(9+6)

Please
Excuse
My
Dear
Aunt
Sally

Parentheses
Exponents (none in this case)
Multiply
Divide
Add
Subtract

4(15)
=60
Dominik [7]3 years ago
3 0
It would be x=4(9+6)
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As part of quality-control program, 3 light bulbs from each bath of 100 are tested. In how many ways can this test batch be chos
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Answer:

<h3>By 161700 ways this test batch can be chosen.</h3>

Step-by-step explanation:

We are given that total number of bulbs are = 100.

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Please note, when order it not important, we apply combination.

Choosing 3 bulbs out of 100 don't need any specific order.

Therefore, applying combination formula for choosing 3 bulbs out of 100 bulbs.

^nCr = \frac{n!}{(n-r)!r!} read as r out of n.

Plugging n=100 and r=3 in above formula, we get

^100C3 = \frac{100!}{(100-3)!3!}

Expanding 100! upto 97!, we get

=\frac{100\times 99\times 98\times 97!}{97!3!}

Crossing out common 97! from top and bottom, we get

=\frac{100\times 99\times 98}{3!}

Expanding 3!, we get

=\frac{100\times 99\times 98}{3\times 2\times 1}

= 100 × 33  × 49

= 161700 ways.

<h3>Therefore,  by 161700 ways this test batch can be chosen.</h3>
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Step-by-step explanation:

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