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784^(1/2)

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Joined: 26 Feb 2016
Posts: 3334
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784^(1/2)  [#permalink]

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New post Updated on: 31 Oct 2018, 21:27
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (00:50) correct 15% (01:17) wrong based on 53 sessions

HideShow timer Statistics

\(\sqrt{784} =\)

A. 28
B. 32
C. 38
D. 56
E. 112

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Originally posted by pushpitkc on 31 Oct 2018, 17:50.
Last edited by Bunuel on 31 Oct 2018, 21:27, edited 2 times in total.
Renamed the topic and edited the tags.
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Re: 784^(1/2)  [#permalink]

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New post 31 Oct 2018, 18:26
pushpitkc wrote:
\(\sqrt{784}\) =

A. 28
B. 32
C. 38
D. 56
E. 112


Unit digit in 784 is 4. Hence, the possible square root number must possess an unit digit of 2. Discard B,C, and D options.

Square of a 3 digit number always yield a number with greater than or equal to 5 nos of digits. Discard option E.

Ans. (A)
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Re: 784^(1/2)  [#permalink]

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New post 31 Oct 2018, 19:01
1
pushpitkc wrote:
\(\sqrt{784}\) =

A. 28
B. 32
C. 38
D. 56
E. 112


\(30^2 = 900\)

Hence answer must be lower than \(30\).

All other options are higher than \(30\) except A.

Hence Answer A.
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Re: 784^(1/2)  [#permalink]

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New post 31 Oct 2018, 21:31
Unit digit is 4. Hence we can boil it down to A & C

Try squaring both options.

28^2 = 784
38^2 = 1444

Answer is A
GMAT Club Bot
Re: 784^(1/2) &nbs [#permalink] 31 Oct 2018, 21:31
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