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our terms are 4, 9, 14 or 14, 9, 4 with d = 5 or -5
Step-by-step explanation:
Let the 3 terms in AP be
a-d, a, a+d
So, Sum of these 3 terms is=
a - d + a + a + d = 3a
So, 3a = 27
a = 9
Also, we are given product of numbers i.e
(a - d) x a x (a + d) = 504
(a² - d²) x a = 504
Putting a = 9, we have
(9² - d²) x 9 = 504
81 - d² = 504/9 = 56
d² = 81 - 56 = 25
so, d = 5 or -5
So, our terms are
9-5, 9, 9+5
or
9+5, 9, 9-5
So, our terms are 4, 9, 14 or 14, 9, 4 with d = 5 or -5
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