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Numbers
What is the sum of the digits of the largest prime factor of 49 + 94 ?
1. 17
2. 16
3. 9
4. None of the above
What is the sum of the digits of the largest prime factor of 49 + 94 ?
1. 17
2. 16
3. 9
4. None of the above
Using Sophie Germain Identity 94 + 4 × 48 = 94 + 4 × 164 =( 92 + 2 × 162 + 2 × 9 + 16 ) ( 92 + 2 × 162 – 2 × 9 + 16 ) = 881 × 305 = 61× 5 × 881 881 is a prime number. Sum of the digits of 881 = 8 + 8 + 1 = 17.
a4 + 4b4 = (a2 + 2b2 + 2ab) (a2 + 2b2 – 2ab)
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good information
By Những dòng bồn cầu thông minh ... , 2 months ago
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