Question
How many terms of the AP must be taken so that their sum is ? Explain the double answer.
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Text solutionVerified
AP is
Consider
First term
Common difference
number of terms
Here, and sum
Which is a quadratic equation
Either, , then
or , then
Number of terms or
Which shows that, th term of AP is zero.
Number of terms are or . So there will be no effect on the sum.
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Question Text | How many terms of the AP must be taken so that their sum is ? Explain the double answer. |
Answer Type | Text solution:1 |
Upvotes | 150 |