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Hello sir , kindly share the solution to this problem -

An institute has 5 departments and each department has 50 students. If students are picked up randomly from all 5 departments to form a committee  , what should be the minimum number of students in the committee so that at least one department should have representation of minimum 5 students? options -

A.  11

B.  15

C.  21

D.  41

E.  None of the above

The maximum number of students can be picked from each department such that 5 students are not selected from the same department is 4.

Therefore, after 4 students from each department are selected i.e 4 x 5 = 20 ,  the 21st student selected will be the fifth student to be selected from one of the 5 departments.

Hence, , 20+1 = 21 students should be selected in total to ensure that at least five students from one of the departments is selected. 

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IMG 20190423 WA0015

2*4*6*8+4*6*8*10 = 4*6*8*12
+6*8*10*12 = 6*8*12*14
+8*10*12*14 = 8*12*14*16

8*12*14*16+10*12*14*16 = 12*14*16*18
+12*14*16*18 = 14*16*18*24
+14*16*18*20 = 14*16*18*44

-1

Find x such that |x + a| - |x - b| > 0 where a < b.

 

 

 

x > b

 

x < (b - a)/2

 

x > (b - a)/2 

 

None of these

i m getting option 3rd 

if you will open it with positive sign 

x+a> x-b

a>-b this is not in options 

opening with negative signs

x+a> -x+b 

2x>b-a

x>(b-a)/2 

which is in the option

none of these given hai

ha par 3rd vala kyu nhi hoga ye nhi samajh aa rha

 

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