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Explanation:

Let p, m and b be the number of pineapple, mango and black-forest pastries respectively.

∴ p + m + b = 23             … (i)

Each pastry cost as many rupees as there were pastries of that kind.

∴ p2 + m2 + b2 = 211      … (ii)

Substituting options in (i) and (ii), we find that only option 2 satisfies both the equations 

Hence, option (b).

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