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2015-11-17T06:16:18+05:30

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Here they are using the samllest prime factor for each numer
45 = 3 * 3 * 5
35 = 5 * 7
34=  2 * 7
Hence 2 is answer
0
34=2*17 but not 2*7
if u want u can correct it again.
2015-11-17T11:33:48+05:30
in this sum
45 = 3*3*5
35 =5*7
6   =2*3
they have considered the smallest prime no. of the product
34 =2*17
therefore 2 is the answer




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