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The square root of 61,504 is

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Bunuel
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The square root of 61,504 is [#permalink] New post   04 Mar 2018, 23:01
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89% (00:44) correct 11% (01:38) wrong based on 232 sessions
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The square root of 61,504 is

(A) 245

(B) 246

(C) 247

(D) 248

(E) 249
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D
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Re: The square root of 61,504 is [#permalink] New post   05 Mar 2018, 13:03
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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] New post   06 Mar 2018, 11:23
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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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Bunuel
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Re: The square root of 61,504 is [#permalink] New post   04 Mar 2018, 23:23
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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



Check below for more:
ALL YOU NEED FOR QUANT ! ! !
Ultimate GMAT Quantitative Megathread
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Re: The square root of 61,504 is [#permalink] New post   05 Mar 2018, 06:11
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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] New post   05 Mar 2018, 06:49
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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] New post   06 Mar 2018, 11:37
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] New post   20 Mar 2018, 10:05
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 [#permalink] New post   30 May 2020, 04:46
The square root of 61,504 is

The unit digit 4 is only valid for either 2 or 8.
Since, we don't have any value in the options ending with 2, we don't need to check any other option.
The answer is option (D) 248
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Re: The square root of 61,504 is [#permalink]
30 May 2020, 04:46
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