jnu

[ritu]

1. In a certain country telephn numbr have 8 digits.the first two digits are the area codr nd are the same within a given area..the last six digitd are the local number nd cannot begin wid 0...how many diff telephn numbers are possible within a given area code in this country??


2.if an economy is a pricr taket in world mkt for both exports nd imports....exchange rate fevaluation will
a.will hsve no effect on bot
b.will coz boy to improve
c.will cause bot to deteriorate
d.turn a trade deficit into balance

[swopnesh]

first two digit are equal so in this two places we can arrange digits in 10 ways,in third place we can not place 0 so their are 9 possibilities,except these places there are 10 digits we can place in each places so total numer of telno is 10*9*10*10*10*10*10=9000000

[swopnesh]

for a specific area it would be 9*10*10*10*10*10=900000

[ritu]

Somebdy pls reply...
Why the first two digits can be filled in 9 ways..nd how do we kno that repitition is allowd or not??

[swopnesh]

my answer is correct or wrong?do u know the answer? if you know it plz explain what is the no of telephone no for a given area?

[duck]

Hi Ritu.. :)

Swopenesh replied it correctly.
For a given area, the first two digits are always the same so there is only one way..For the third place, zero cant come So, 9 ways to fill the third place and after that 10 ways.
Thus, there will be
1*1*9*10*10*10*10*10 different telephone numbers.

And it would be given in the question if repitition is not allowed.

[ritu]

Ohk..thanx duck nd swapan:-)
Nd duck pls reply to second question as well....nd one thing more...in pinky's question u replied that lm shifts down coz of rise in expected inflation...but jist somedays back...i asked a question that wot is the effect of increase in expected inflation on lm. Curve....amit sir had replied that it wud nt have any effect on lm curve in Y,r space??? Why this paradox????

[ritu]

Ok ok...m. Sry i got my answer...lm curve wont change if its against nominal i but it does change the real roi....m soo sry...i always jump to conclusion so quickly:-(:-(

[duck]

Hi Ritu.. :)

He said , In (Y,i) space, LM would not shift.
And i said in (Y,r) space.
:)

[duck]

No problem.. :)

[ritu]

So when Is. Nd Lm intersect then which roi is determined....???the nominal one nd we subtract ftom it the expected inflation to get real roi...???
M a bit confused here..interest rate in Is relation is resl...intetest rate in Lm curve is nominal...so when they intersect doesnt that mean that nominal nd rl roi are same...???

[swopnesh]

but first two places i.e area code should be filled in how many ways? 9 or 10?

[seema]

it should b filled in 10 ways. total possible tel no = 90,00,000
& total possible tel no within a given area code = 9,00,000

[duck]

Hi Ritu.. :)

Suppose, we are plotting in (Y,r) space.
Now, intersection of IS and LM will give you "r"
As IS is a function of "r" , an increase in Expected inflation will have no impact on it.
But, LM is a function of "i" where i = r+expectd inflation.
Thus, for an increase in expected inflation, "r" must fall to keep the same level of "i"
Therefore, equilibrium level of "r" has decreased.
And LM shift down resulting in a increase in equilibrium output.