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Mathematics 19 Online
OpenStudy (anonymous):

find the sum of the series 4 , -3 , -10 to 23 terms

OpenStudy (confluxepic):

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OpenStudy (confluxepic):

First find the values of all the terms by finding the pattern.

OpenStudy (confluxepic):

Then add them all up.

OpenStudy (anonymous):

But how can i do

OpenStudy (akashdeepdeb):

^ @confluxepic No way. It is an arithmetic progression. a = 4 d = -7 n = 23 S = n/2 * (2a + (n-1)d)

OpenStudy (confluxepic):

Oh. @AkashdeepDeb

OpenStudy (anonymous):

It is 264.5

OpenStudy (anonymous):

Right or wrong

OpenStudy (anonymous):

23/2*(2*4+(23-1)-7)

OpenStudy (akashdeepdeb):

I think it must be a negative number.

OpenStudy (anonymous):

-1679

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