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1 5 7 2 2 5 = [ a ; b , c , d , e ] m e a n s a + b + c + d + e 1 1 1 1 = 1 5 7 2 2 5 So we have to convert 1 5 7 2 2 5 to continued fraction and then find out the values of a , b , c , d a n d e So let,s start: 1 5 7 2 2 5 = 1 1 5 7 6 8 = 1 + 1 5 7 6 8 = 1 + 6 8 1 5 7 1 6 8 1 5 7 = 2 6 8 2 1 = 2 + 6 8 2 1 = 2 + 2 1 6 8 1 2 1 6 8 = 3 2 1 5 = 3 + 2 1 5 = 3 + 5 2 1 1 5 2 1 = 4 5 1 = 4 + 5 1 ( H e r e p r o c e s s s t o p s ) Observe that each of these fractions can be substituted into the previous fraction.Combining all of these ,we get: 1 5 7 2 2 5 = 1 + 2 + 3 + 4 + 5 1 1 1 1 Equating this with a + b + c + d + e 1 1 1 1 , We get a = 1 , b = 2 , c = 3 , d = 4 a n d e = 5 Adding all these,we get a + b + c + d + e = 1 + 2 + 3 + 4 + 5 = 2 5 × 6 = 2 3 0 = 1 5 If anyone wants to know more about continued fractions,he can do so here