IFT 2012 questionThe annual production in cement industry is subjected to business cycles.The production increases for two consecutive years consistently by 18% and decreases by 12% in the third year.Again in the next two years,it increases by 18% each year and decreases by 12% in the third year.Taking 2008 as the base year,what will be the approximate effect on cement production in 2012 ?a)24%increaseb)37%increasec)45%increased)60%increaseHow to approach this question?
c) 45% increase
1.18*1.18*0.88*1.18 This comes close to 1.44 So 45% increase
Duels in the town of discretion are rarely fatal. There, each contestant comes at a random moment between 5 a.m. and 6 a.m. on the appointed day and leaves exactly 5 minutes later, honor served, unless his opponent arrives within the time interval then they fight. What fraction of duels lead to violence? ..
@grkkrg How do we know that the increase or decrease would be applied keeping the FIRST year in mind and not the LATEST year?? I did keeping latest year and scrwed the question.
@chillfactor thanks.I understood your solution,it may sound silly but i want to know how did u realise that c(6,4) approach would lead to redundant cases ? I mean is there any way to avoid such approach in exam to save time ?
I have already explained that why your approach was incorrect.
Solve this question, it will help you.
In how many ways we can form a team of five from 9 persons, three persons each from three different countries, such that at least one person from each country is selected.
@grkkrg How do we know that the increase or decrease would be applied keeping the FIRST year in mind and not the LATEST year?? I did keeping latest year and scrwed the question.
Yup, 2 ˆš221 is correct.Check the attachment for another approachI have already explained that why your approach was incorrect.Solve this question, it will help you.In how many ways we can form a team of five from 9 persons, three persons each from three different countries, such that at least one person from each country is selected.
In how many ways we can form a team of five from 9 persons, three persons each from three different countries, such that at least one person from each country is selected.
3 1 1:Select which 3 people from 1 country: 3C1Select 1 person from 2nd country = 3C1Select 1 person from 3rd country = 3C1Total = 27What am I missing?
there are 3 countries so u can choose 311 as -> 3!/2! ->3 ways
Yup, 2 ˆš221 is correct.Check the attachment for another approachI have already explained that why your approach was incorrect.Solve this question, it will help you.In how many ways we can form a team of five from 9 persons, three persons each from three different countries, such that at least one person from each country is selected.
Yup, 2 ˆš221 is correct.Check the attachment for another approachI have already explained that why your approach was incorrect.Solve this question, it will help you.In how many ways we can form a team of five from 9 persons, three persons each from three different countries, such that at least one person from each country is selected.
total = 9c5 = 126 ways
when all 5 selected persons are from only 2 countries = 3c2*6c5 = 18 ways
In how many ways we can form a team of five from 9 persons, three persons each from three different countries, such that at least one person from each country is selected.
@chillfactor1)person from same country thrice,then 2 persons from different countries(aaabc)- 3*3*3*5!/3!2)(aabbc)-3*3*3*5!/2!2!is 1350 answer correct ?
you are permuting people also, q is only about selecting team
In how many ways we can form a team of five from 9 persons, three persons each from three different countries, such that at least one person from each country is selected.
