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Two closely coiled helical springs with stiffnesses k₁ and k₂ respectively are connected in series. The stiffness of an equivalent spring is given by

$\frac { k_1 k_2} {k_1 + k_2 }$

$\frac { k_1 - k_2} {k_1 + k_2 }$

$\frac { k_1 + k_2} {k_1 k_2 }$

$\frac { k_1 - k_2} {k_1 k_2 }$

Answer : Option A

Explanation :

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