To check the highest power of 12 in 49! we need to check the highest powers of 4 and 3 in it
Highest power of 3 in 49!=22
Highest power of 2 in 49!=46
∴ Highest power of 4 in 49!=462=23
∴ Highest power of 12 will be 22 (Since the common power between 3 and 4 is 22)