Discussion

Explanation:

After the exchange, Alok comes to Yash’s position and becomes 21st from left. 

The same position also corresponds to the 30th position from right. 

∴ Total number of boys in the row = (position of Yash from left) + (position of Yash from right) – 1

= 21 + 30 – 1 = 50.

Hence, option (c).

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