explain why 7 x 11 x 13 plus 13 and 7 x 6 x 5 x 4 x 3 multiply two multiply 1 +5 are composite number ?
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7 × 11 × 13 + 13
= 1001 + 13
= 1014
Therefore, composite numbers are those which have factor rather than 1 or itself. and 1014's factors are 13*13*3*2.
7 × 6 × 5 × 4 × 3 × 2 × 1 + 5
= 5040 + 5
= 5045
therefore, factor of 5045 is 1,5,1009, 5045, so it's a composite number
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