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Numerical Ability
Algebra
IN base 7,a number is written using the digit 0,1,6,the number 21 in base 7 is equal to 2*7+1=15 in base 10.similarly the number 135 in base 7 is 1x72+3x7+5=75 in base 10.what is the sum of base 7 numbers 1234 and 6543 in base 7?
A.10111
B.11101
C.11110
D.11011
Read Solution (Total 2)
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- 1234+6543=7777
take LCM of 7777 we get 1111-0
so answer is (c) - 10 years agoHelpfull: Yes(7) No(8)
- 7^2 7^1 7^0
1 3 5
i.e : 1*49+ 3*7+ 5*1=75
7^3 7^2 7^1 7^0
1 2 3 4
i.e: 343*1+49*2+7*3+1*4=466
similarly, 6543=2334
therefore, 466+2334=2800
i.e,
7^4 7^3 7^2 7^1 7^0
1 1 1 1 0
2401+343+49+7+0=2880
ans)11110 - 10 years agoHelpfull: Yes(4) No(0)
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