Question

If the digit in unit's place of a number is 2 then what will be the digit at unit place in its cube ?



a) 2 b) 4 c) 6 d) 8

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Answer 1

THE CORRECT ANSWER IS 8.

HOPE IT HELPS YOU

Answer 2

SOLUTION

TO CHOOSE THE CORRECT OPTION

If the digit in unit's place of a number is 2 then the digit at unit place in its cube will be

a) 2

b) 4

c) 6

d) 8

EVALUATION

We know that a³ = a × a × a

Now

• If last digit of a number is 0 then last three digit of cube of the number is 000

• If last digit of a number is 1 then unit digit of cube of the number is 1

• If last digit of a number is 2 then unit digit of cube of the number is 8

• If last digit of a number is 3 then unit digit of cube of the number is 7

• If last digit of a number is 4 then unit digit of cube of the number is 4

• If last digit of a number is 5 then unit digit of cube of the number is 5

• If last digit of a number is 6 then unit digit of cube of the number is 6

• If last digit of a number is 7 then unit digit of cube of the number is 3

• If last digit of a number is 8 then unit digit of cube of the number is 2

• If last digit of a number is 9 then unit digit of cube of the number is 9

From above we can conclude that If last digit of a number is 2 then unit digit of cube of the number is 8

FINAL ANSWER

Hence the correct option is d) 8

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