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Expert replies
Source: — Problem Solving |

by PussInBoots » Tue Oct 07, 2008 6:28 am
<20> + <22> = <20> * (1 + 22) = <20> * 23
23 is largest prime factor, since all of prime factors of <20> are smaller than 20


<20> = 2 * 4 * 6 * 8 * 10 * 12 * 14 * 16 * 18 * 20: prime factors 2, 3, 5, 7
<22> = <20> * 22
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by arthi » Tue Oct 07, 2008 7:10 am
is it 5?

whats the OA?
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by Morgoth » Tue Oct 07, 2008 7:37 am
Largest factor would be 23

<20> + <22>

<20> = 2*4*6......*20

<22> = <20>*22

Therefore,

<20> + <22> = <20> + <20>*22 = <20> ( 1+22) = <20> * 23

Thus, 23.

Hope this helps.
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