SOLUTION: How many terms of the A.P 26,21,16,11..........are needed to give the sum 11?
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Question 768612: How many terms of the A.P 26,21,16,11..........are needed to give the sum 11?
Found 2 solutions by oscargut, MathLover1:
Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
How many terms of the A.P 26,21,16,11..........are needed to give the sum 11?
the rest are: 6,1,-4,-9,-14,-19,-24
Answer: 11 terms
You can ask me more at: mthman@gmail.com
Thanks
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
26,21,16,11..........are needed to give the sum 11
26-21=5
21-16=5
16-11=5
so, d=-5
, where ‘n’ is the number of terms, ‘a’ is first term, ‘d’ is the common difference
,,
....solve for
....solve for using quadratic formula
and
so, we need only whole number
26,21,16,11,6,1,-4,-9,-14,-19,-24
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