Answer:
Given,
Sum of first three terms is 27
Assume, the first three terms as a – d, a, a + d [where a is the first term and d is the common difference]
Sum of first three terms is
a – d + a + a + d = 27
3a = 27
a = 9
It is given that the product of three terms is 648
So, a3 – ad2 = 648
Substituting the value of a = 9,
93 – 9d2 = 648
729 – 9d2 = 648
81 = 9d2
d = 3 or d = – 3
Hence, the given terms are a – d, a, a + d which is 6, 9, 12.