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29 Apr 2025, 09:56
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Difficulty:
95%
(hard)
Question Stats:
30% (01:29) correct
70%
(01:25)
wrong
based on 112
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What is the digit at the unit's place in the total integer value of 11^21 - 17^77 ?
A. 0
B. 2
C. 4
D. 6
E. 7
A. 0
B. 2
C. 4
D. 6
E. 7
29 Apr 2025, 11:49
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\(11^{21} - 17^{77}\)
Now, by the concept of cyclicity, the last digit of \(11^{21}\) is 1, and \(17^{77}\) is 7
Since \(17^{77}\) > \(11^{21}\), we will get 1 - 7 = -6
Answer D.
Now, by the concept of cyclicity, the last digit of \(11^{21}\) is 1, and \(17^{77}\) is 7
Since \(17^{77}\) > \(11^{21}\), we will get 1 - 7 = -6
Answer D.
29 Apr 2025, 22:21
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