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यदि X = {1, 2, 3, 4} तो X से स्वयं X में सभी आच्छादक फलनों की संख्या है

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यदि X = {1, 2, 3, 4} तो X से स्वयं X में सभी आच्छादक फलनों की संख्या है

(A) 4

(B) 16

(C) 24

(D) इनमें कोई नहीं

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सही विकल्प है (C) 24

4! = 4 x 3 x 2 x 1

= 24

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