If X=28+(1X2X3X4.......X16X28) AND Y=17+(1X2X3....X17) then show that X-Y is a composite number

Asked by Shazia Salim | 17th May, 2013, 07:25: AM

Expert Answer:

X - Y = [28+(1X2X3X4.......X16X28)] - [17+(1X2X3....X17)]
        = (28-17) + (1x2x3x4.....x16) (28 - 17)
        = 11 + (1x2x3x4.....x16) 11
        = 11[1 + (1x2x3x4.....x16)]
Hence, X-Y is a composite number.

Answered by  | 17th May, 2013, 05:07: PM

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