uwrongboi uwrongboi

05-07-2017
Mathematics

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Which is a possible expression for the series
–7 + 12 –17 +22 –27

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Which is a possible expression for the series 7 12 17 22 27 VIEW IMAGE FOR ANSWER CHOICES class=

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RickyChen RickyChen

05-07-2017

Without considering the sign:

It's sigma(1 to 5, 5k+2)

Since the first item is minus, you simply add (-1)^k

So it's sigma(1 to 5, (-1)^k * (5k+2)

I choose A

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