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zloy xaker [14]
2 years ago
13

What is the answer for all of them I don't know what to do

Mathematics
2 answers:
Anuta_ua [19.1K]2 years ago
7 0
5/30=1/6
4/28=1/7
16/18=8/9
7/35=1/5
9/15=3/5
3/12=1/4
ahrayia [7]2 years ago
7 0
1. 1
2. 7
3. 8
4. 1
5. 5
6. 4
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A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter
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Answer:

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Step-by-step explanation:

<u><em>If the question was similar to the one given below </em></u>

A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetical order. What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?

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If we use 3 letters or any distinct letter as a comma such that 2 are in alphabetical order then we would get

4C2= 6 ways to use these letters and the comma

If we use 4 letters or any distinct letter as a comma such that 2 are in alphabetical order then we would get

5C2= 10 ways to use these letters and the comma

If we use 5 letters or any distinct letter as a comma such that 2 are in alphabetical order then we would get

6C2= 15 ways to use these letters and the comma

We need the least number of the alphabets to assign codes to 12 participants.

So the least number of alphabets is 5 because it can give codes to at least to  12 people .

Pair of alphabets + distinct letter ≥ 12

5 + 1  ≥ 12

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15  ≥ 12

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