Take 6 balls from 8 balls
first time 3 balance 3, if equal then take remaining 2 balls for weighing.
if 3 not equal to 3 on first weighing then take the minimum weighted 3 balls and weigh 2 balls and one ball in hand in second weighing to found the lowest weighted ball.

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Interview Question for Software Engineer at Cisco Systems:

Find the only lighter ball from 8 balls using a balance scale only two times.

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