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____ [38]
3 years ago
14

Ishaan is 3 times as old as Christopher and is also 14 years older then Christopher. How old is ishaan?

Mathematics
1 answer:
rosijanka [135]3 years ago
4 0
I=Ishaan
C=Christopher
I/3=C
I-14=C
Substitute
I/3=I-14
I=3I-42
-2I=-42
Ishann = 21
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Answer:

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Step-by-step explanation:

In this question:

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Step-by-step explanation:

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In the combination the order is NOT important and is signed as follows:

C (n, r) = n! / r! (n - r)!

Now, to start with part a, which corresponds to a combination because the order here is not important. Thus

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Part b, would also be a combination, defined as follows

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Therefore, several cases must be made:

C (10, 0) = 10! / 0! * (10-0)! = 10! / (0! * 10!) = 1

C (10, 1) = 10! / 1! * (10-1)! = 10! / (1! * 9!) = 10

C (10, 2) = 10! / 2! * (10-2)! = 10! / (2! * 8!) = 45

C (10, 3) = 10! / 3! * (10-3)! = 10! / (2! * 7!) = 120

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1 + 10 + 45 + 120 = 176 possible total scenarios.

part c, also corresponds to a combination, and to be equal it must be divided by two since the coin is thrown 10 times, it would be 10/2 = 5, that is our r = 5

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C (10, 5) = 10! / 5! * (10-5)! = 10! / (2! * 5!) = 252

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