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Explanation:

Consider the solution to the first question of this set.

Average time taken for 13th day = 21+2×821+8=3729 = 1.27
Average time taken for 14th day = 15+2×315+3=2118 = 1.16
Average time taken for 15th day = 8+2×88+8=2416 = 1.5
Average time taken for 16th day = 13+2×1013+10=3323 = 1.43

Least of these average times is 1.16 for 14th day.

Hence, option (d).

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