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Q.

The sum of first 'n' odd numbers be 625 then write the value of n,


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a

125

b

35

c

15

d

25 

answer is D.

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Detailed Solution

Given,
The sum of first 'n' odd numbers = 625
We know that
Sum of first n odd numbers = n2
So,
⇒n2=625 ⇒n2=252  ⇒n=25  Hence, the value of n is 25.
Correct option is 4.
 
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