Find the HCF of 288, 504, 648.
H.C.F of three given numbers = H.C.F of (H.C.F of any two numbers), third number
First, find the H.C.F of 288 and 504.
∴ H.C.F of 288 and 504 is 72.
Now, find the H.C.F of 72 and 648.
∴ H.C.F of 72 and 648 is 72.
Hence, H.C.F of 288, 504, 648 is 72.