Shruti

i was trying to download a software for wifi hotspot. i use a LAN connection for internet, but even after successfully installing that software i was not able to share my laptop's internet connection to my android phone. Was this because my laptop doesn't have any wifi card or something or because there's some other issue. pls help.

I want to download twenty and a half wishes book by Denise grover Swank.But i can't find any website to download ebook or in pdf format for FREE.Help me out pls...i really need this book.

1) In election 3 persons are to be elected from 6 candidates. A voter can cast any number of votes but not more than candidates to be elected. In how many ways can he cast his vote.

2) There are 10 students in a class in which three A,B,C are girls. The number of ways to arrange them in a row when any 2 girls out of 3 never comes together is.?

3) The number of different 4 letter words that can be formed out letters of the word MORADABAD is.

=> in 3rd question, i know from theory in my book that it can be calculated as coeff. of x^4 in 4!(1+x)^4 (1+x+(x^2/2!)) (1+x+(x^2/2!)+(x^3/3!)) as there are 3'A' , 2'D' and 1 each of M,R,O,B. and it is giving me correct answer but calculating coeff. is taking so much time (and i personally really hate it). I want to know is there any shortcut or a simpler way to solve this question.

thanks in advance.

1) if Ʃ( cos^( -1) ai) (i=1 to n) =0 then what is the value of Ʃ( ai) (i=0 to n) ? [ i is subscript].

2) find range of f(x)= sin^(-1)x + tan^(-1) x + sec^(-1) x.

3) if u= cot^(-1)(√tan a) - tan^(-1)(√tan a) , then tan(π/4 - u/2) is equal to

4) value of x for which sin( cos^(-1) (1+x)) = cos(tan^(-1) x)

any help will be greatly appreciated. Thank you.

lim┬(x→∞) [ {(x^2+1)/(x+1)} - ax - b ] = 0

then find (a,b).

1+ 3/4 + (3.5)/(4.8) + (3.5.7)/(4.8.12) +........infinity (here '.' means multiply)