Question

class 10th
Use Euclids lemma division to show that cube of positive integer is of the form 9m or 9m+1 or 9m+8.
check wheather the following will end with 0 or not for -n which is natural number i) (15)n
II) (28)n.
check wheather the following numbers are composite or not
I) 2*3+5
II) 7*19*31+31
III) 7*6*5*4*3*2*1+7*5



pls answer fast

Answer 1

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