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CBSE Class 10 Answered

if (a+b+c)+(ab+bc+ca)+(a*b*c)=100, then find a+b+c
Asked by swetha | 27 Dec, 2013, 04:19: PM
answered-by-expert Expert Answer
Kindly cross check, the correct statement of the given condition should be (a+b+c)+(ab+bc+ca)+(a*b*c)=1000
 
Answer:
 
Consider the product (a+1)(b+1)(c+1).
 
(a+1)(b+1)(c+1) = a+d+c+ab+bc+ca+abc+1 

So we can rewrite the goven equation as
(a+1)(b+1)(c+1) - 1 = 1000 
(a+1)(b+1)(c+1) = 1001 
(a+1)(b+1)(c+1) = 7*11*13 
(a+1)(b+1)(c+1) = (6+1)*(10+1)*(12+1) 

Thus, a+b+c = 6+10+12=28
Answered by | 28 Dec, 2013, 12:47: AM

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