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7+77+777+.....+77777 upto 20 terms. Find the last 3 digits
Read Solution (Total 6)
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- 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 - 11 years agoHelpfull: Yes(80) No(4)
- 070
7*20
7*19
7*18 - 11 years agoHelpfull: Yes(6) No(2)
- 7
+77
+7...7
+...777 upto 20 terms so
__________________
......070 - 11 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
- 11 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 - 11 years agoHelpfull: Yes(2) No(0)
- 7*20=140
7*19=133
7*18=126
total=399 - 11 years agoHelpfull: Yes(0) No(5)
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