Let the first root be a.
So the second root as per the question is 1/a.
Product of zeroes = a × 1/a
When we compare the above quadratic equation with the generalized one we get,
ax2 + bx + c = 0
∴ a = 5, b = 13, c = k
Product of zeroes = c / a
k/5 = 1
Therefore k = 5
So the correct answer is C .
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