find all natural triplets (a,b,c) with property a<b<c that satisfy this equation 3/7=1/a+1/ab+1/abc
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The given equations are ab+bc=44 ..........(i)
And, ac+bc=23 .........(ii)
⇒c(a+b)=23, which is a prime number
So, the two factors must be 1 & 23.
c=1 and $$a + b = 23$$
⇒b=23−a
Put these values in (i), b(a+c)=44
⇒(23−a)(a+1)=44
⇒23a−a
2
+23−a=44
⇒a
2
−22a+21=0
⇒a
2
−21a−a+21=0
⇒a(a−21)−1(a−21)=0
⇒(a−21)(a−1)=0
⇒a=1,21
For, a=1,b=22
For a=21,b=2
∴b=22,2
The solution sets are (1,22,1);(21,2,1).
Hence, the number of solutions sets =2.
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