In the arrangement shown in figure a 1 , a 2 , a 3 and a 4 are the accelerations of masses m 1 , m 2 , m 3 and m 4 respectively. Which of the following relation is true for this arrangement?

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The figure shows the tension acting on each string in the system. ∑ T → · a → = 0 ⇒ 4 T a 1 + 2 T a 2 + T a 3 + T a 4 = 0 ⇒ 4 a 1 + 2 a 2 + a 3 + a 4 = 0

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