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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Apr 2008 21:13:52 IST
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Sorry guyz edit:
If a1, a2, a3,......... are in A.P. such that a1+a5+a10+a15+a20+a24=225 then a1+a2+a3+..............+a24=???
plz give detailed solution
a15 is der i missed d term while typin |
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3 Apr 2008 21:17:53 IST
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ne1 plz
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since it is an A.P with let common difference d;
a1+(a1+4d)+(a1+9d)+(a1+14d)+(a1+19d)+(a1+23d)=225
6a1+69d=225
2a1+23d=75 -(1)
sum of 24 terms
S=24/2[2(a1)+(24-1)d]
=12[2a1+23d]
=12(75) [from 1]
=900.
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3 Apr 2008 21:25:56 IST
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where did a1 + 14d come from he hasnt said a15 in the sum
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Nitwit Blubber Odment Tweak
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3 Apr 2008 21:25:59 IST
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thnx
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3 Apr 2008 21:28:17 IST
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edit
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" Always remember money isn't everything but make sure you have made a lot of it before talking such nonsense!"
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3 Apr 2008 21:32:03 IST
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hay ankit u have taken one extra term....
a1+(a1+4d)+(a1+9d)+(a1+19d)+(a1+23d)=225
solving ul get
a1+11d=45
sum=24/2 [2a1+(24-1)d]
solving thin u shud get the ans
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
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3 Apr 2008 21:32:50 IST
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the problem is you dont know d so the answer cant be got :)
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3 Apr 2008 21:33:18 IST
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hey bt how did he get the rite ans???
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3 Apr 2008 21:34:15 IST
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mohit how can u further solve it??
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3 Apr 2008 21:34:25 IST
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exactly rohit!!
but tht fellow who 1st posted the ans took the term a15 also...
spot nv i think...u agree??
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3 Apr 2008 21:34:25 IST
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bcos you might have missed the term a15 in the quesand he included it
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3 Apr 2008 21:34:36 IST
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I think the question is a1+a5+a10+a15+a20+a24=225 Then..... In an AP an+a1=an-1+a2=........ Hence a1+a24=a2+a23=........... 3(a1+a24)=225 a1+a24=75 Hence 24/2 (a1+a24) =12 (75) = 900 rate me if correct.........
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3 Apr 2008 21:34:58 IST
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Moderation Team
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