SOLUTION: a1, a2, a3 , a4............an......... in the sequence above , each term after the first term is equal to the preceding term plus the constant c. if a1 + a3+ a5= 27 , wh

Question 471953: a1, a2, a3 , a4............an.........
in the sequence above , each term after the first term is equal to the preceding term plus the constant c. if a1 + a3+ a5= 27 , what is the value of a2+ a4?
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
The sequence is arithmetic, so we say that

, and so on.

Here, since the sum of the 1st, 3rd, 5th terms is 27, we have

The sum of the second and fourth terms is

This is equal to 2*9 = 18 since we can substitute a_1 + 2c with 9.
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