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Question

What is the digit in the unit place of 3 99 ?

This question was previously asked in
CDS I 2020 Elementary Mathematics Previous Year Paper (02-Feb-2020)
The correct answer is

7

Answer: 7.

Result The unit digit of 3^{99} is 7. Unit digits 2, 3, 7, 8: The unit digit pattern has a cycle length of 4, as shown with the powers of 3.

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  3. What is the digit at unit place in 28 96 × 26 92 × 94 22 ?

  4. The digit in the units place of (34) 9 + (46) 21  - (43) 27  is:

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