7+77+777+.....+77777 upto 20 terms. Find the last 3 digits

• for the unit place..7+7+7....7(till 20th digit)=140 so the last digit wud b 0 and 14 will b carry...
  070 ans
  similarly,for ten's place..7+7+...(19th digit)=133+14(from previous carry)=147 so 7 will the second last digit..
  For hundredth's place 7+7+...(18th digit)=126+14(previous carry)=140...therefore 0 wud be the third last digit...
  So the final answer wud be 070
• 10 years agoHelpfull: Yes(80) No(4)
• 070
  7*20
  7*19
  7*18
• 10 years agoHelpfull: Yes(6) No(2)
• 7
  +77
  +7...7
  +...777 upto 20 terms so
  __________________
  ......070
• 10 years agoHelpfull: Yes(5) No(0)
• 007*20=140 070*19=1330 700*18=12600 12600+1330+140=14070 taking last 3 digits answer is 070
• 10 years agoHelpfull: Yes(3) No(3)
• 7*20=140:-last digit 0 n carry to next stage is 14;
  7*19+14=147:- last digit is 7 n carry to next stage is 14;
  7*18+14=140:-last digit is 0
• 10 years agoHelpfull: Yes(2) No(0)
• 7*20=140
  7*19=133
  7*18=126
  total=399
• 10 years agoHelpfull: Yes(0) No(5)