Question

1. If X=28+(1 X 2 X 3 X 4 ..... X 16 X 28) and Y = 17+(1 X 2 X 3 X .... X 17), then Which of the following is/are true? 1) X is a composite number. 2) Y is a prime number 3) X - Y is a prime number 4) X + Y is a composite number *​

Answer 1

Answer:

x -y = [ 28 + ( 1 × 2 × 3 × y ....... × 16 × 28) ]

[17 + ( 1 × 2 × 3 × ........ × 17) ]

( 28 - 17 ) + ( 1 × 2 × 3 × ......... × 16 ) 16 × 28

11 + ( 1 × 2 × 3 × 4 × ........... × 16 ) 11

11 [ 1+ ( 1 × 2 × 3 × 4 × .......... × 16 ) ]

x and y are composite.

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