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A spring of force constant k is cut into lengths of ratio 1: 2:3. They are connected in series and the new force constant is K’. Then they are connected in parallel and force constant is k”. Then k’: k” is
(a) 1:9
(b) 1:11
(c) 1:14
(d) 1:6
(NEET 2017)
1) A
2) B
3) C
4) D
2) B