Three numbers form an arithmetic sequence with common difference of #15#. If first number is increased by #3# and third number by #21#, they become in geometric sequence. What is the first number?
1 Answer
Jan 29, 2018
First number of arithmatic sequence is
Explanation:
As numbers form an arithmetic sequence with common difference
Increasing first number by
or
or
or
i.e.
Hence, first number of arithmati sequence is
and numbers are