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mathmath333
 one year ago
Amartya Banerjee has forgotten the telephone number
of his best friend Abhijit Roy. All he remembers is that
the number had 8digits and ended with an odd number
and had exactly one nine . How many possible numbers
does Amartya have to try to be sure that he gets
correct number ?
mathmath333
 one year ago
Amartya Banerjee has forgotten the telephone number of his best friend Abhijit Roy. All he remembers is that the number had 8digits and ended with an odd number and had exactly one nine . How many possible numbers does Amartya have to try to be sure that he gets correct number ?

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mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0\(\large \color{black}{\begin{align} & \normalsize \text{ Amartya Banerjee has forgotten the telephone number }\hspace{.33em}\\~\\ & \normalsize \text{ of his best friend Abhijit Roy. All he remembers is that }\hspace{.33em}\\~\\ & \normalsize \text{ the number had 8digits and ended with an odd number }\hspace{.33em}\\~\\ & \normalsize \text{ and had exactly one nine . How many possible numbers}\hspace{.33em}\\~\\ & \normalsize \text{ does Amartya have to try to be sure that he gets}\hspace{.33em}\\~\\ & \normalsize \text{ correct number ?}\hspace{.33em}\\~\\ & a.)\ 104\cdot 9^{5} \hspace{.33em}\\~\\ & b.)\ 113\cdot 9^{5} \hspace{.33em}\\~\\ & c.)\ 300\cdot 9^{5} \hspace{.33em}\\~\\ & d.)\ 764\cdot 9^{5}\cdot 6! \hspace{.33em}\\~\\ \end{align}}\)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3lets take cases :) case 1 9 at the enddw:1443696020352:dw now 9 at 1st>dw:1443696142160:dw now for 9 at 2nd/3rd/4th/5th/6th/7th place> lets take 9 at 2 dw:1443696303711:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i think you can use the number more than once in each cell...

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0u did consider the numbers to be distinct but the telephone numbers can repeat the digits

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3oh naww >.< such a grt mistake X.X

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0but good thought process

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0lol, where did he go

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0do u mean the answer is \(\large \color{black}{\begin{align} & 8\times 9^{6}\times 6+8\times 9^{6}+8\times 9^{7} \hspace{.33em}\\~\\ \end{align}}\)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3ok so the 1st case wuld be dw:1443697084281:dw 2nddw:1443697152608:dw 3rddw:1443697267227:dw

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0is that in options

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0answer is \(\large \color{black}{\begin{align} & 300\times 9^{5}\hspace{.33em}\\~\\ \end{align}}\)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3while correcting it i made 2 mistakes >.< 1st  i forgot that 9 comes only once 2ndo.o i forgot what the mistake was..

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0all of them with 9's should be 8

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0nah whoops, i forgot to count for a second

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3u can fill that place with 9 diff nos :)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3yea happens >.< silly mistakes are the most annoying things

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0haha, yep good luck @mathmath333 and good work @imqwerty

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3:) thanks btw what is the squirrel in ur pfp showin? its hrt? :D

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0haha i dunno, when i first came on open study, i thought it would be good to have something funny so people laugh

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0nah, its a superman squirell

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3XD u wanted to make ppl laugh :D HAHhahah nice thoughts :)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0haha yep! anyway, time for early bed. catchya

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.3c ya ima also leave for class :)
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