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# What is the remainder when (1!)^3+ (2!)^3 + (3!)^3 +.....(11

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What is the remainder when (1!)^3+ (2!)^3 + (3!)^3 +.....(11 [#permalink]

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04 Nov 2009, 01:07
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Question Stats:

75% (08:38) correct 25% (01:55) wrong based on 277 sessions

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What is the remainder when (1!)^3+ (2!)^3 + (3!)^3 +.....(1152!)^3 is divided by 1152?

1. 125
2. 225
3. 325
[Reveal] Spoiler: OA

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04 Nov 2009, 04:19
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The ans has to be 225. all the terms in the sequence after (3!)^3 are divisible by 1152 and hence remainder is 0. Upto (3!)^3, sum of all numbers, i.e. 1+8+216 = 225 which is the remainder!!

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31 Jan 2010, 06:01
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Is there a specific approach to tackle this?
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31 Jan 2010, 07:17
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jeeteshsingh wrote:
Is there a specific approach to tackle this?

No specific approach.

We have the sum of many numbers: $$(1!)^3+ (2!)^3 + (3!)^3 +...+(1152!)^3$$ and want to determine the remainder when this sum is divided by 1152.

First we should do the prime factorization of 1152: $$1152=2^7*3^2$$.

Consider the third and fourth terms:
$$(3!)^3=2^3*3^3$$ not divisible by 1152;
$$(4!)^3=2^9*3^3=2^2*3*(2^7*3^2)=12*1152$$ divisible by 1152, and all the other terms after will be divisible by 1152.

We'll get $$\{(1!)^3+ (2!)^3 + (3!)^3\} +\{(4!)^3+...+(1152!)^3\}=225+1152k$$ and this sum divided by 1152 will result remainder of 225.
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12 Feb 2010, 18:45
Nice Explanation!

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14 Jul 2011, 03:13
Bunuel....+1 to you...
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16 Jul 2011, 03:13
good question. Thanks Bunuel for sharing the approach for these problem!
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Re: What is the remainder when (1!)^3+ (2!)^3 + (3!)^3 +.....(11 [#permalink]

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19 Oct 2012, 04:21
Did .. the same thing as Bunuel..

But took 8 minutes..

In actual exam.. I would have guessed and moved on

What is the source of this problem?

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18 Jul 2013, 06:20
Bunuel wrote:
jeeteshsingh wrote:
Is there a specific approach to tackle this?

No specific approach.

We have the sum of many numbers: $$(1!)^3+ (2!)^3 + (3!)^3 +...+(1152!)^3$$ and want to determine the remainder when this sum is divided by 1152.

First we should do the prime factorization of 1152: $$1152=2^7*3^2$$.

Consider the third and fourth terms:
$$(3!)^3=2^3*3^3$$ not divisible by 1152;
$$(4!)^3=2^9*3^3=2^2*3*(2^7*3^2)=12*1152$$ divisible by 1152, and all the other terms after will be divisible by 1152.

We'll get $$\{(1!)^3+ (2!)^3 + (3!)^3\} +\{(4!)^3+...+(1152!)^3\}=225+1152k$$ and this sum divided by 1152 will result remainder of 225.

Hi Bunnel,
To get the remainder, we dont have to reduce the fraction right?
That is we cant do - 225/1152 = 25/ 128 and get remainder 25?

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21 Jul 2013, 02:24
cumulonimbus wrote:
Bunuel wrote:
jeeteshsingh wrote:
Is there a specific approach to tackle this?

No specific approach.

We have the sum of many numbers: $$(1!)^3+ (2!)^3 + (3!)^3 +...+(1152!)^3$$ and want to determine the remainder when this sum is divided by 1152.

First we should do the prime factorization of 1152: $$1152=2^7*3^2$$.

Consider the third and fourth terms:
$$(3!)^3=2^3*3^3$$ not divisible by 1152;
$$(4!)^3=2^9*3^3=2^2*3*(2^7*3^2)=12*1152$$ divisible by 1152, and all the other terms after will be divisible by 1152.

We'll get $$\{(1!)^3+ (2!)^3 + (3!)^3\} +\{(4!)^3+...+(1152!)^3\}=225+1152k$$ and this sum divided by 1152 will result remainder of 225.

Hi Bunnel,
To get the remainder, we dont have to reduce the fraction right?
That is we cant do - 225/1152 = 25/ 128 and get remainder 25?

Yes, 225 divided by 1152 yields the remainder of 225. The same way as 2 divided by 4 yields the remainder of 2, not 1 (1:2).
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Re: What is the remainder when (1!)^3+ (2!)^3 + (3!)^3 +.....(11 [#permalink]

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12 Aug 2015, 12:22
starting from 4!^3=24^3 all numbers are divisible by 1152, i.e. remainder equal to 0

Only 1!^3, 2!^3 and 3!^3 are not divisible by 1152 and have remainder equal to 1,8 and 216, respectively.

If sum numbers we can sum their remanders to find total remainder, which is 216+8+1+0=225

B

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Re: What is the remainder when (1!)^3+ (2!)^3 + (3!)^3 +.....(11 [#permalink]

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01 Dec 2017, 06:06
factorize 1152 into 2^7*3^2

see carefully all are cubic factorial

we need to look beyonf (4!)^3 as from here onwards remainder is zero

so consider cubic factorial of 1 , 2 and 3 and sum will give 225. and this number on division by 1152 gives 225.

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Re: What is the remainder when (1!)^3+ (2!)^3 + (3!)^3 +.....(11   [#permalink] 01 Dec 2017, 06:06
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