if a,b,c and d can be 0 so there is a direct formula for that- C(7+4-1,4-1)=C(10,3)here 7 is sum of all the numbers and 4 is the number of variables..
yaar need little more explanation because earlier we deduct 3 out of 10 and formulated eqn a+b+c+d=7 then we select 3 stating that b and c cant be zero .i know i am lacking some basic concept kindly tell how to formulate these equations
The efiiciency of a man is reduced by half every 2 hrs. At max efficiency he could have completed the job in 150 hrs. How many hrs does it take him to complete the job, if his efficiency becomes max after every 8hrs and then reduced as mentioned above?
The efiiciency of a man is reduced by half every 2 hrs. At max efficiency he could have completed the job in 150 hrs. How many hrs does it take him to complete the job, if his efficiency becomes max after every 8hrs and then reduced as mentioned above?
say his does 8 units of work in first 2 hrs so
2-4 hrs: 4 units
4-6 hrs: 2 units
6-8 hrs: 1 units
so in 8 hrs he does (8+4+2+1) = 15 units
Total work = 150*4
hence time taken = (150*(8/2))/15 = 40 blocks of 8 hrs.
The efiiciency of a man is reduced by half every 2 hrs. At max efficiency he could have completed the job in 150 hrs. How many hrs does it take him to complete the job, if his efficiency becomes max after every 8hrs and then reduced as mentioned above?
Lagta hai vaibhav bahi time and work pe master degrre kar rahe hai
Let the maximum efficiency be 16x
so total work = 150*16x = 2400x
now in first 8 hours he works with efficiencies 16x 8x 4x and 2x
so 30x of work is done in 8 hours
so to do 2100x he would require 2400/30 = 80 hours
say his does 8 units of work in first 2 hrs so2-4 hrs: 4 units4-6 hrs: 2 units6-8 hrs: 1 unitsso in 8 hrs he does (8+4+2+1) = 15 unitsTotal work = 150*8hence time taken = (150*8)/15 = 80 hrs.ATDH.
Lagta hai vaibhav bahi time and work pe master degrre kar rahe hai Let the maximum efficiency be 16x so total work = 150*16x = 2100xnow in first 8 hours he works with efficiencies 16x 8x 4x and 2xso 30x of work is done in 8 hoursso to do 2100x he would require 2100/30 = 70 hours???
bhai time material se hai ans is 320..if u want I ll share the solution.
The efiiciency of a man is reduced by half every 2 hrs. At max efficiency he could have completed the job in 150 hrs. How many hrs does it take him to complete the job, if his efficiency becomes max after every 8hrs and then reduced as mentioned above?
. At maximum efficiency he finishes the work in 150 hrs that means amount of work done in 2 hrs at maximum efficiency = 1/75. For next two hours he finishes = 1/150 amount of work. In next two hours he does = 1/300 amount of work and in another two hours he finishs = 1/600 amount of work. That means in total 8 hrs he does = (1/75)(1 + 0.5 + 0.25 + 0.125) = 1.875/75 = 1/40 amount of work. As he regains his maximum efficiency after every 8 hrs, he does the same amount of work in every 8 hrs span. 8*40=320 hrs
aage aur bi question aane h... unhe solve karo.. 
