[janvats]

Two different infinite geometric progressions
both have sum 1 and the same second term.
One has third term 1/8.
The second term of the progression upto
2 places of decimal is[/FONT][/FONT](A) 0.40 (B) 0.30 (C) 0.25 (D) 0.20 (E) 0.15

[Decent_flirt]

Originally Posted by mahi101987

no

ur close to the answer anyways

6800?? Is it right dude??

[v!vek@rora]

Originally Posted by janvats

Two different infinite geometric progressions
both have sum 1 and the same second term.
One has third term 1/8.
The second term of the progression upto
2 places of decimal is[/FONT][/FONT](A) 0.40 (B) 0.30 (C) 0.25 (D) 0.20 (E) 0.15

c.........0.25

rgds
vivek arora

[janvats]

t ans given is choice e. 0.15

[Decent_flirt]

Originally Posted by janvats

Two different infinite geometric progressions
both have sum 1 and the same second term.
One has third term 1/8.
The second term of the progression upto
2 places of decimal is[/FONT][/FONT](A) 0.40 (B) 0.30 (C) 0.25 (D) 0.20 (E) 0.15

Let the 2nd term be a and the common ratio be r.
First term = a/r ; Sum = (a/r)/(1-r)=1
Therefore a/r = 1-r..................1
Given third term = ar = 1/8

Multipying 1 by r^2 ar = r^2 - r^3 = 1/8

this gives r = 1/2
THEREFORE a = 1/4

Therefore second term = 0.25

[manjushaa]

hey how do i do these?
1.the amt of work in a leather factory is increased by 50%.By what % is it neccessary to increase the no of workers to complete the new amt of work in previously planned time,if the productivity of the new labour is 25% more(40%)
2.a shopkeeper first raises the price of jewellery by x% then he decreases the new price by x %.after 1 such up down cycle,the price of a jewellery is decreased by rs21025.after the 2nd updown cycle it was sold for rs484416.what was the original price of the jewellery?(rs 525625)

[v!vek@rora]

Originally Posted by Decent_flirt

Let the 2nd term be a and the common ratio be r.
First term = a/r ; Sum = (a/r)/(1-r)=1
Therefore a/r = 1-r..................1
Given third term = ar = 1/8

Multipying 1 by r^2 ar = r^2 - r^3 = 1/8

this gives r = 1/2
THEREFORE a = 1/4

Therefore second term = 0.25

Originally Posted by janvats

t ans given is choice e. 0.15

same M getin ...r u sure answer is .15....!!!1

rgds
vivek arora

[subu_222412]

Hello Guys..
Please help!!

How many 6-digit numbers contain exactly 4 different digits?

a) 4536
b) 294840
c) 191520
d) None of these

Thanks in advance!!

[masoom]

Originally Posted by subu_222412

Hello Guys..
Please help!!

How many 6-digit numbers contain exactly 4 different digits?

a) 4536
b) 294840
c) 191520
d) None of these

Thanks in advance!!

is the answer is b) 294840...

[Decent_flirt]

Originally Posted by manjushaa

hey how do i do these?
1.the amt of work in a leather factory is increased by 50%.By what % is it neccessary to increase the no of workers to complete the new amt of work in previously planned time,if the productivity of the new labour is 25% more(40%)
2.a shopkeeper first raises the price of jewellery by x% then he decreases the new price by x %.after 1 such up down cycle,the price of a jewellery is decreased by rs21025.after the 2nd updown cycle it was sold for rs484416.what was the original price of the jewellery?(rs 525625)

Leth the initial work = 1
let the number of workers be 1
Let the number of days in which it is completed = 1.
Therefor efficiency = 1.

Now work = 1.5
efficiency = 1.25
Therefore 1.25*x=1.5

x=1.2
Therefore increase = 20% and not 40%