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Q 2n girls are randomly divided into 2 subgroups contaitning n girls each.The probablity that two tallest girls are in diff groups... Ans given is n/2(2n-1) ..but i am getting (n-1)/2n ...

can someone plz tell me if it is necessary to take a test series for BITSAT and AIEEE or buy a book or in simple words, do any kind of other preparation for the exams? or will the preparation for IIT be enough for the exam? : ...

For how many values of "a" will the following equation have two equal roots: x^3 + (a^2++a-1)x^2 + (a^3-a^2-a)x -a^3 =0 i got 4 as ans.... plz verify... ...

I know this has been done before here...but I couldnt understand soln there or at goiit..where bhatt sir did it So posting it again.... If f(x).f'(x).f"(x)>0 for all xεR.Then prove that f(x) is increasing function ...

If c is positive and 2ax^2 + 3bx +5c=0, does not have any real roots, then prove that 2a-3b+5c>0. ...

A soln of weak acid was titrated with NaOH. The equivalence pt. was reached when 36.12 ml of 0.10 (N) NaOH have been added. Now 18.06 ml of 0.1(N) HCl was added to the titrated soln.The pH was found to be 4.92. What's Ka of a ...

THIS IS A SINCERE REQUEST FROM MY SIDE : PLEASE ENSURE THAT U POST DA ANSWERS TO UR QUESTIIONS......... IF THE QUESTN IS SUCH THAT THE ANSWER SPOILS THE QUESTION THEN ITS FINE, BUT STILL PL. KEEP THE USER'S(WHO TRY N SOLV THA ...

A car is travelling at 5 m/s.another car in the parking lot just 11 m ahead of the 1st car starts at an acc. of 1m/s2.in what time will both meet? a)4 s b)6 s c)4 and 6 s d)Never ...

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Prove that n= 5125-1/525-1 is a composite number. ...

*Image* Bring about this conversion in 2 steps. ...

*Image* WHAT IS THE PRODUCT? ...

Q1 graph of x2+y2=0 in 3D is ?? Q2 Locus of xy+yz=0 in 3D is ??? ...

there are 2radioactive substances who emit 2 and beta emissions there disintegration constant are in the ration 2 is to 3 fto hv equal probabilities of getting 2 and b particles the ration of the number of nuclei f a to the n ...

A typhoon originates in the Indian ocean.satellite imaging shows that the distance travelled by it are 105 and 95 in the 1st 2 hours after it originated.It is dangerous at speeds above 50 kmph.find the time taken for it to su ...

Why all the psots are not in descending order ???and one posts shows -4 sec [11][11][3][3] *Image* ...

true or false.....with explaination 1) work done by kinetic friction on a body is never 0 2)work done by Kinetic friction on a system is always negative plzzz give expalination also ...

yesterday i was seeing the sove papers of nsep and i saw that the equivalent resistance m was asked in one question and it was writtent that equivalent reisstance is when calculated the internal resistance is not added.... is ...

Do we need to know and learn these all big names and formulae...becoz these have been used in YG P1 Wilkinson catalyst Vaska's compound Cis-Platin ...

arrange in order of increasing reactivity of following monomers towards anionic polymerisation CH3CH=CH2,C6H5CH=CH2,CH2=CHCN?? ...

so how was it??????? ...

hey any one knows free online video tutorails fot iit??? ...

Q1. 9 persons enter a lift from the ground floor of a building which stops at 10 floors exulding the ground floor ,if its known that persons will leave in groups of 2,3,4 in different floors ..In how many ways can this happen ...

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in dc pandey it is writen there is no difference between waves represented by the equations y=Asin(wt-kx) and y=Asin(kx-wt) thats easy now we know the difference is that one is moving downwards and other is moving upwards now ...

*Image* → *Image* + *Image* Reagent used are con.HNO3+Con.H2SO4 Which is a major of the products? ...

An unknown alcohol gives blue ppt. in Victor Meyer's test.The no. of alpha H atoms in alcohol are ___ ? They gave the ans as 1,,saying R2CH-OH has one alpha H .. they have taken the underlined carbon to be alpha carbon,,but t ...

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*Image* + Cl2/hu ---> ...