Common difference 4

The 28th term of an arithmetic progression is −5. Find its common difference if the first term is 31.

Final Answer:

d =  -1.3333

Step-by-step explanation:

n=28 a28=5 a1=31  a28 = a1 + d (n1)  d=n1a28a1=281(5)31=1.3333



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