Question

Find p so that p+7, 3p+9, p+3, ... form an arithmetic sequence .

Answer 1

Answer:

P= -2

Explanation:

P+7, 3p+9, p+3, .... are in an arithmetic sequence

So 3p+9 is the arithmetic mean of p+7 and p+3

Thus, 2(3p+9)=p+7+p+3

6p+18=2p+10

6p-2p=10-18

4p=-8

P= -2