Discussion

Explanation:

When two players play a game such that 

• they pick balls alternately, 
• each player can pick balls from 1 to n,
​​​​​​​• last player to pick wins.

The winning strategy in such scenario is to leave 4k marbles in your turn.

If Samyukta picked 2 marbles to leave 4k marbles it means she would’ve picked from 4k + 2 marbles.

Between 20 and 23, only 22 is of the form 4k + 2.

∴ Samyukta picked from 22 marbles.

Hence, 22.

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