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Question

Sum of GCD of 18 & 27 and 77 & 132 is

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Solution

First, find GCD of 18 & 27.


18=2×3×3
27=3×3×3
GCD is 3×3=9.

Now, for 77 & 132 we get,


77=7×11
132=2×2×3×11
GCD is 11.
Sum of GCDs =9+11=20.

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