Question

a=-18,d=?,n=18,An=-5 find the common difference of an AP​

Answer 1

Answer:

Use the formula that

nth term =a+(n-1)d

Where a = first term , d = common difference and n = term

Its given that

nth term = -5

n = 18

d = -3

Now substitute the values

nth term = a+(n-1)d

-5 = a + (18–1)-3

-5 = a + (17)-3

-5 = a -51

a = 51–5

Step-by-step explanation:

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