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if

_{[ r=1]}

^{[ n]} t_{r ^{=n(n+1)(n+2)(n+3)/12 ,find}[r=1 ]}

^{[ infinity]} 1/tr........

??

the answer is 3/4!!!!!!!!

answer is only 3/4

itz one of my fav questions........its pretty long.....surely i will rate who ever solves it 1st(experts not included)

are you interested??????

how about 25% off on each??

if

_{[ r=1]}

^{[ n]} t_{r ^{=n(n+1)(n+2)(n+3)/12 ,find}[r=1 ]}

^{[ infinity]} 1/tr........

i have the following books:

1.mechanics vol 1 -dc pandey -arihant

2.problems in mathematics-s.k goyal-arihant

3.higher algebra -hall & knight-surjeet publications

4.plane trigonometry-s.l.loney-surjeet publications

5.coordinate geometry -s.l.loney-surjeet publicatios

6.concise inorganic chemistry - j.d.lee

all of them are in excellent condition(as i bought them only a month back)..

i want 2 sell them...anyone interested????

consider
sind[cosec(a1)cosec(a2)+...............+cosec(an-1)cosec(an)]
sind[1/sina1sina2+1/sina2sina3+.............+1/sinan-1sinan]
open the brackets.......
sind/sina1sina2+..........sind/sinan-1sinan.
we know that a2-a1=a4-a3=an-an-1=d
hence.......
sin(a2-a1)/sina1sina2+sin(a3-a2)/sina2sina3+...+sin(an-an-1)/sinansinan-1
sina1cosa2-cosa1sina2/sina1sina2+...............+sinan-1cosan-cosan-1sinan/sinansinan-1
cota1-cota2+cota2-cota3+..............+cotan-1-cotan
cota1-cotan

about that 65 days for iit book.....1st of all..... iit preparation is not abt the "time" u spend FOR preparing but about how clear u are wid de concepts.....
i have not heard much abt this book..maybe u shud go through the book befre buying it.....if u think it will help u then u can buy it...
(i think u u'd rather the books that i suggested, but its your life u gotta decide it!!)......the math & physics books 2gether are quite cheap....chem is costly(each book is around 400/-...if u dont wanna shell out that much cash u shud go for the all in 1 books like ..o.p agarwal or tmh they are quite usefull....they give u alot of practice....besides these books are very very popular..u can always buy them 2nd hand or rent them frm a library...check out this site e-books

and if that dinesh book is misleading drop it right away.....(now u've learnt a very important lesson.....always make sure u go through the book/review b4 buying a book)

if u appreciate my thoughts PLS rate meeeeeee
!!!!!!!

as rumor goes............the 2009 jee will hav subjective +objective questions.......
wat then???

Hi pawanseerwani,
aquarezia's link has de best books for iit.......but there are 2 many books u shud follow 1 or 2 standard books..

math
-a das gupta(it rox)
-m.l.knanna

physics
-resnik and halliday(for clear understanding of the theory)
-h c verma

chem
arihant series
morrison boyd
jd lee

apart from the above u can go for arihant series as they hav boks specifically for jee!!

certain concepts in the jee are of much higher standard than cbse or stateboard.....
u hav 2 get used de way of solving numericals of jee level.....
a reputed coaching center is the best way 2 start

you can always refer notes but u will miss out the key concepts taught in class dat are most help 2 de jee......

only if u hav de full focus and "never say die spirit"
u can crack de jee........like napolean said "BURN THE BRIDGES"

me 22222
faadhil21@gmail.com

ya tmh is gud book....u can start from it directly
other buks are
1)physics
h c verma
resnik halliday
2)math
a das gupta
3)arihant series
morrison boyd and jd lee for higher knowledge of concepts..

ya and about books.........
for physics use
1) concepts in physics -h.c.verma
chemistry-
1)arihant series...
mathematics
1)problems plus in iit mathematics-das gupta (i use it and it rocks) or new pattern mathematics for iit-jee-m.l.knanna

u can also refer the study material in this site.....
its pretty good..i learnt a lot frm it

hmmmmmmmm.......

u can start preparing now........if ur in 11th u have enough time 2 cover all portions and have a gud chance in de jee.....if ur in 12th.then u gotta put in a lot of hard work coz u have 2 cop up wid scool 2.!

preparing for jee....increases ur level of thinking...as ur thinking level increases ur problem solving level increases(i speak by experience).....it does not decrease....by the 1 of de major challenges in de jje is 2 complete de papper...

so obviosly all those who cleared the jee are FAST in solving problems!!!!

thought and speed are directly propotional!!!

rate me if that helped u!!!!