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otez555 [7]
3 years ago
12

WILL GIVE BRAINLIEST PLEASE ANSWER HURRYYYYY

Mathematics
1 answer:
Elan Coil [88]3 years ago
4 0

Answer:

Ok so sorry if not right so sorry but I think

Step-by-step explanation:

4-5=1/ 4-3=1-5-3 ok so u will add all this up and i think it should at least be 17 again so sorry if not right :(

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If the sum of the even integers between 1 and k, inclusive, is equal to 2k, what is the value of k?
Alisiya [41]
If k is odd, then

\displaystyle\sum_{n=1}^{\lfloor k/2\rfloor}2n=2\dfrac{\left\lfloor\frac k2\right\rfloor\left(\left\lfloor\frac k2\right\rfloor+1\right)}2=\left\lfloor\dfrac k2\right\rfloor^2+\left\lfloor\dfrac k2\right\rfloor

while if k is even, then the sum would be

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Now consider the partial sum up to the second-to-last term,

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Subtracting this from the previous partial sum, we have

S-S^*=k-1

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S=2k
S^*=2(k-2)

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S-S^*=2k-2(k-2)=4

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5 0
3 years ago
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