Answer:
lcm=30
hcf: 3
step by step:
lcm of 6: 6, 12, 18, 24, 30, 36,
hcf of 6: 1, 2, 3 and 6.
lcm of 15: 15, 30, 45, 60, 75, 90
hcf of 15: 1, 3, 5 and 15
