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H.C.F. of 3240, 3600 and a third number ...

H.C.F. of `3240, 3600` and a third number is `36` and their L.C.M. is `2^4xx3^5xx5^2xx7^2`. The third number is (a) `2^2xx3^5xx7^2` (b) `2^2xx5^3xx7^2` (c) `2^5xx5^2xx7^2` (d) `2^3xx3^5xx7^2`

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