Q.

The number of co-polymer(s) in the below list is/are X
(Nylon-6, Buna-N, Dacron, Buna-S, Teflon, PHBV)
The number of carbohydrate(s) which show mutarotation in the below list is/are Y
αD(+)glucopyranose,βD(+) glucopyranose, lactose 
αD() fructofuranose,  βD() fructofuransose, sucrose, maltose) 
The value of  (XY)

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answer is -2.

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Detailed Solution

X = 4 (BunaN, BunaS, PHBV, Dacron); Y = 6(alpha and beta Glucopyranose, alpha and beta fructofuranose, maltose and lactose)

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The number of co-polymer(s) in the below list is/are X(Nylon-6, Buna-N, Dacron, Buna-S, Teflon, PHBV)The number of carbohydrate(s) which show mutarotation in the below list is/are Y( α−D−(+)−glucopyranose,β−D−(+) glucopyranose, lactose α−D−(−)− fructofuranose,  β−D−(−)− fructofuransose, sucrose, maltose) The value of  (X−Y)