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The square root of 61,504 is

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The square root of 61,504 is  [#permalink]

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New post 04 Mar 2018, 22:01
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Re: The square root of 61,504 is  [#permalink]

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New post 04 Mar 2018, 22:23
Bunuel wrote:
The square root of 61,504 is

(A) 245

(B) 246

(C) 247

(D) 248

(E) 249


8. Exponents and Roots of Numbers



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Re: The square root of 61,504 is  [#permalink]

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New post 05 Mar 2018, 05:11
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Bunuel wrote:
The square root of 61,504 is

(A) 245

(B) 246

(C) 247

(D) 248

(E) 249


Evaluating answer options and their squares
(A) 245 - 5*5 = 25

(B) 246 - 6*6 = 36

(C) 247 - 7*7 = 49

(D) 248 - 8*8 = 64

(E) 249 - 9*9 = 81

Only Option D(248) is a possible square root of 61504!
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Re: The square root of 61,504 is  [#permalink]

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New post 05 Mar 2018, 05:49
Bunuel wrote:
The square root of 61,504 is

(A) 245

(B) 246

(C) 247

(D) 248

(E) 249

Use the units digit rule ,except (D) none of the numbers will yeild units digit as 4, hence correct answer must be (D)
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Re: The square root of 61,504 is  [#permalink]

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New post 05 Mar 2018, 12:03
We can calculate using the power of unit digits. In the answer choices only D will end uwith unit digit 4.

Ans : D
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Re: The square root of 61,504 is  [#permalink]

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New post 06 Mar 2018, 10:23
Bunuel wrote:
The square root of 61,504 is

(A) 245

(B) 246

(C) 247

(D) 248

(E) 249


We are looking for a number that, when squared, will have a units digit of 4. Of our answer choices, only 248 will have a units digit of 4 when it is squared.

Answer: D
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Re: The square root of 61,504 is  [#permalink]

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New post 06 Mar 2018, 10:37
Bunuel wrote:
The square root of 61,504 is

(A) 245

(B) 246

(C) 247

(D) 248

(E) 249



Only square of 248 will result in unit's digit of 4
Answer D
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Re: The square root of 61,504 is  [#permalink]

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New post 20 Mar 2018, 09:05
Bunuel wrote:
The square root of 61,504 is

(A) 245

(B) 246

(C) 247

(D) 248

(E) 249


Unit digit of the given number 61504 is 4, therefore we need to find an answer choice which gives us a unit digit of 4 when squared.

248 * 248 = 61504

Therefore (D).
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Re: The square root of 61,504 is &nbs [#permalink] 20 Mar 2018, 09:05
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