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Let $x=623^{57}-27^{30},$, then what is the unit’s digit of $x$ ?
- A4
- B3
- C2
- D6
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CCommunity
1). 4
$623$ Unit digit is 3
Power is 57
$3^{57} ~ 3^1$ and Unit Digit Would be $3$
similarly 27^30 would be $7^2$ and Unit digit would be $9$
$3 - 9 ~ 13 - 9 = 4$
Hence 4 would be the answer
$623$ Unit digit is 3
Power is 57
$3^{57} ~ 3^1$ and Unit Digit Would be $3$
similarly 27^30 would be $7^2$ and Unit digit would be $9$
$3 - 9 ~ 13 - 9 = 4$
Hence 4 would be the answer