Question
The last digit of $3^40$ is
Answer: Option B
Answer: (b)$3^1 = 3; 3^2 = 9; 3^3 = 27;$$3^4 = 81; 3^5 = 243 ;$ ..... Remainder on dividing 40 by 4 = 0∴ Unit’s digit in $3^40$ = 1
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Answer: (b)$3^1 = 3; 3^2 = 9; 3^3 = 27;$$3^4 = 81; 3^5 = 243 ;$ ..... Remainder on dividing 40 by 4 = 0∴ Unit’s digit in $3^40$ = 1
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