Question

If the common difference of an AP is -12 whose nth term is an, then find the value of a20 - a17
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Answer 1

Answer:

The value of given question is -36

Step-by-step explanation:

Given,

d = -12

Formula,

an = a + (n-1)d

Therefore,

a20 - a17 = (a + 19d) - (a + 16d)

=3d = 3(-12) = -36