explain why 7*6*5*4*3*2*1*+5 is a composite number
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5
7*6*5*4*3*2*1+5 = 5(7*6*4*3*2*1+1) ----------- 5 is common
= 5*1009
therefore, 7*6*5*4*3*2*1+1 is a composite number as it has a common factor 5 other than 1.
= 5*1009
therefore, 7*6*5*4*3*2*1+1 is a composite number as it has a common factor 5 other than 1.
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2
because after complete solution we got 5 in ones digit
7*6*5*4*3*2*1 always zero in ones digit 2*5 = 10
and when 0 is multiplied by any number it always zero
and in ones digit 0+5 = 5
and solution is always divisble by itself , 5 and 1
7*6*5*4*3*2*1 always zero in ones digit 2*5 = 10
and when 0 is multiplied by any number it always zero
and in ones digit 0+5 = 5
and solution is always divisble by itself , 5 and 1
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