Question

If a20-a12 = -32, then the common difference of
the AP is​

Answer 1

Answer:

Common Difference = -4

Step-by-step explanation:

Formula of a term in an AP is

nTh term = a + (n-1) d

where a is the first term of that AP and d is the common difference of the AP.

Therefore,

a20 = a + 19d

and

a12 = a +11d

therefore

a + 19d - a - 11d = -32

8d = -32

d = -4

Answer 2

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