7 + 77+ 777 + . . . + 77777...7777. The addition shown here has 21 terms and the last term consists of the digits seven, 21 times. Find three last digits of the above sum.
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Answer:
Answer is 7777
Step-by-step explanation:
As we can see before blank there is three times sevens and after blank there are five sevens so the answer is 7777
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