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01 Apr 2024, 09:16
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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62% (01:50) correct
38%
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wrong
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Consider the sum \(7+ 77+ 777 +7777+ 77777+ ....+ 77,777,777,777,777,777,777\), where the last addend has 20 digits. Find the digit in the hundreds place of the resulting sum.
A) 0
B) 8
C) 6
D) 4
E) 1
[Source: MATHCOUNTS]
A) 0
B) 8
C) 6
D) 4
E) 1
[Source: MATHCOUNTS]
01 Apr 2024, 10:24
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Answer A
adding the units first 7*20 =140
Written 0 as unit digit retain 14
Then the ten’s digit 7*19=133 + 14 = 147
Write 7 as a ten’s digit of the sum retain 14
Adding the hundred digit 7*18= 126 +14=140
Write 0 as the hundred digit
Posted from my mobile device
adding the units first 7*20 =140
Written 0 as unit digit retain 14
Then the ten’s digit 7*19=133 + 14 = 147
Write 7 as a ten’s digit of the sum retain 14
Adding the hundred digit 7*18= 126 +14=140
Write 0 as the hundred digit
Posted from my mobile device
harsh96
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03 Sep 2026, 11:53
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can please someone explain how to solve it
