@tshaik said:how many different 7-digit numbers are there the sum of whose digits are odd?(a)45.10^5(b)24.10^5(c)224320(d)None of theseguys please post the solution.answer given is (a)
a
@tshaik said:how many different 7-digit numbers are there the sum of whose digits are odd?(a)45.10^5(b)24.10^5(c)224320(d)None of theseguys please post the solution.answer given is (a)
45*10^5 ?
total no.s = 9*10^6
half will have odd sum of digits
Q 6
@DeAdLy said:explain karo!! jawab dena hoga tumhe..
are bhai book me explanation hai..but mujhe ni samjh aaya
time work efficiency
A 27 1%b 9 3%
c 3 9%
d 1 27%
work efficiency is reciprocl of time taken
A+B+C=13% OF work
A+B+D=31% of work
so A+B+D=13 days
A+B+C= 31 days
c 3 9%
d 1 27%
work efficiency is reciprocl of time taken
A+B+C=13% OF work
A+B+D=31% of work
so A+B+D=13 days
A+B+C= 31 days
A task is assigned to a group of 11 men, not all of whom have the same capacity to work. Every day exactly 2 men out of the group work on the task, with no pair of men working together twice. Even after all the possible pairs have worked once, all the men together had to work for exactly one day more to finish the task. What is the number of days that will be required for all the men working together to finish the job?(a) 11 (b) 21 (c) 33 (d) none of the foregoing
@ishu1991 said:A task is assigned to a group of 11 men, not all of whom have the same capacity to work. Every day exactly 2 men out of the group work on the task, with no pair of men working together twice. Even after all the possible pairs have worked once, all the men together had to work for exactly one day more to finish the task. What is the number of days that will be required for all the men working together to finish the job?(a) 11 (b) 21 (c) 33 (d) none of the foregoing
B
@ishu1991
Shld be 11..
Let the rate of 11 different person be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 n 11 units/day..
Thus, Total units of work that each pair of workers collectively wrk = 10*66 units..
Now, Total Units of work = 10*66 + 66 = 66*11 units..
Thus, Number of days requird = 66*11/66 = 11..