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Q.


The five rational numbers between 3 5   and 4 5   are:

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a

17 30 , 20 30 , 21 30 , 22 30  and  23 30  

b

19 30 , 20 30 , 21 30 , 22 30  and  25 30  

c

19 30 , 20 30 , 21 30 , 22 30  and  23 30  

d

19 30 , 20 30 , 27 30 , 22 30  and  23 30    

answer is C.

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Detailed Solution

Given: Number are 3 5   and 4 5  .
Denominator Method:
As we are asked to find out 5 numbers between 3 5   and 4 5  , so we multiply the numerator and denominator of  3 5   and 4 5    by 5 + 1, i.e., 6.
Here, let us apply the denominator method:
Now, we shall multiply the numerator and denominator of 3 5   and 4 5   by 6:
3 5 = 3×6 5×6 = 18 30  and  4 5 = 4×6 5×6 = 24 30  
Now, let us Insert 5 rational numbers between 18 30    and 24 30   :
By increasing the numerators by 1 of 18 30   successively, we get the required 5 numbers:
19 30 , 20 30 , 21 30 , 22 30  and  23 30  
Hence, five rational numbers between 3 5    and 4 5  are:
19 30 , 20 30 , 21 30 , 22 30  and  23 30   Therefore, the correct option is 3.
 
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