وه
a= -18.9
d=2.5
n= ?
an=36
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The value of n is 10.
Explanation:
Given, a = - 18.9, d = 2.5 and aₙ= 3.6
We must know that,
aₙ = a + (n - 1) d
or, 3.6 = - 18.9 + (n - 1) (2.5)
or, 3.6 = - 18.9 + 2.5 n - 2.5
or, 2.5 n = 3.6 + 18.9 + 2.5
or, 2.5 n = 25
or, n = 25 / 2.5
or, n = 10
Therefore, the value of n is 10.
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