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Five balls, blue, red, pink, yellow and green are kept on different steps of a staircase of 5 steps from bottom to top, respectively. These balls are now rearranged randomly. What is the probability that the balls on the first step and second step from the top are coloured pink and yellow, respectively?

 
1/60
1/90
1/10
1/20

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How the two balls can be arranged in 3! ways

It is written respectively top and below hence correct

Wrong as 2 pink and yellow balls can also be arranged in 2 ways thats why answer would be C