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