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OpenStudy (anonymous):
A progression has a first term of 12 and a fifth term of 18. Find the sum of the first 25 terms in the progression is aritmetic.
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OpenStudy (akashdeepdeb):
If th progression is an AP! Then a = 12 and a+4d = 18 So d = 6/4 = 3/2 = 1.5 So sum can be found by S = n/2(2a+(n-1)d) You have a = 12 d=1.5 n = 25 Just put it in the equation and then SOLVE!! :) Getting me? :)
OpenStudy (anonymous):
ummm im ok :) it'll take me a bit to understand could i get back to you ?
OpenStudy (anonymous):
Perfect ! i get it ! thanx a lot
OpenStudy (akashdeepdeb):
:)
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