Question

Sum of the 5 terms of an arithmetic sequence is 45. What is the third term? The common difference is 4 write the first two terms? Write another arithmetic sequence having the sum of the first 5 terms is 45

Answer 1

Answer:

3rd term =9

first two terms=1,5

A,.P=1,5,9,13,17

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Answer 2

Answer:

5term = 45 =5/2[2a+4(d)]

      18 = 2a+4d

       9 = a+2d

3rd term = a3 = a+2d= 9

d=4                    a+2×4=9

{(a=1) a1=1,a2=5}    

              45= 5/2[2a+4d]

                 9=a+2d

suppose   a3=3

                 9=3+2d

              9-3=2d

                  6=2d

                  d=6/2=3

∴the arithmetic sequence of this sequence is 3,6,9,12,15

Step-by-step explanation:

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