Question

Explain why 42n cannot end with 0 also find the unit place digit in the expansion of 42n if n=17

Answer 1

42 to the power of n cannot end with "0"

42 can be written as 2*7*3

but only nos having factors 2 and 5 end with 0

so 42 to power of n is cannot end with "0"

sry I don't know the answer for 2nd question

hope this helps u.

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