Latest TCS Aptitude Question SOLUTION: 14. When numbers are written in base b, we have 12 x 25 = 333. The value of b is a. None of the choices b. 7 c. 8 d. 6

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14. When numbers are written in base b, we have 12 x 25 = 333. The value of b is
a. None of the choices
b. 7
c. 8
d. 6

Asked In TCS Hari Priya Kazipeta (11 years ago)

Unsolved Read Solution (6)

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Read Solution (6) :

vijai  (11 years ago)

for this problem we have to go fro options......
first take option b.7
LHS......12=7^0*2+7^1*1=2+7=9
LHS.......25=7^0*5=5+7^1*2=5+14=19
LHS....we obtain 9*19=171
for RHS....333=7^0*3+7^1*3+7^2*3=171
so LHS=RHS
note(all these calc mus b done from right 2 left)
ANS is ....7

Is this solution Helpfull? Yes (27) | No (2)  

RIMAN  (11 years ago)

ANS : b.7
Now base 7 representation of 12 is = 7*1+2 = 9
and similarly base 7 representation of 25 is 2*7+5 =19
now 9*19 = 171
lastly base 7 representation of 333 is = (7^2)*3+ 7*3 + 3 = 171
So ans is 7

Is this solution Helpfull? Yes (9) | No (3)  

satyanarayana  (11 years ago)

throw options LHS=RHS we hv to verify
7^0*2+7^1*1=9,7^0*5+7^1*2=19
7^0*3+7^1*3+7^2*3=171 i.e RHS
19*9=171 i.e LHS

Is this solution Helpfull? Yes (3) | No (4)  

subhabrata chakraborty  (9 years ago)

(b+2)(2b+5)=3b^2+3b+3
by solving we get
b=7

Is this solution Helpfull? Yes (2) | No   

shyamlesh dash  (11 years ago)

hey hara priya pls mail me some questions shyamleshd@gmail.com

Is this solution Helpfull? Yes (1) | No (4)  

venkatesh  (11 years ago)

hey hari priya please send de tcs papers to dimpu.k@gmail.com

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