How many terms of the AP :- -15, -13, -11,... are needed to make the sum -55. Explain the reason for double answer.
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when we solving the problem it gives the quadratic equation
n^2 -16n + 55 = 0
So n -11= 0 & n -5 = 0
n^2 -16n + 55 = 0
So n -11= 0 & n -5 = 0
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