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Q.

The number of functions f, from the set A=xN : x210x+90 to the set B=n2 : nN such that f(x)(x3)2+1, for every xA, is ______.

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answer is 1440.

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Detailed Solution

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x210x+90(x1)(x9)0x[1, 9]A={1,2,3,4,5,6,7,8,9}f(x)(x3)2+1x=1 : f(1)512,22x=2 : f(2)212x=3 : f(3)112x=4 : f(4)212x=5 : f(5)512,22x=6 : f(6)1012,22,32x=7 : f(7)1712,22,32,42x=8 : f(8)2612,22,32,42,52x=9 : f(9)3712,22,32,42,52,62

Total number of such function = 2(6!) = 2(720) = 1440

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