shobby

Interested in Men's Medium size Tee :D.. but Women's Small would also do for my girl friend..:tup:

Hi guys, Just wrote my GMAT again few hours back and got 710 (Q49 V37). Not a great score compared to what other guys are scoring, but still a significant improvement from my first attempt in Oct'08 (620 Q49 V26). Thanks for all ur help!:tup:

This is how it is explained in OE too. Any shortcut pls!

Got it. Thanks!:)

Diff approach: 3 couples can be chosen in 5C3 ways 1 person from each of these 3 couples can be chosen in 2C1 ways. Total = 5C3*2C1*2C1*2C1 = 10*2*2*2 = 80 ways

OA is E. My doubt is why are we dividing it by 3!. If the coins were distinct, answer would be 25*16*9*3!. Since coins are identical it should be 25*16*9 only. I know I'm missing something here, but not sure what!:crazy:

Maybe this could help a bit: Every unanswered gives -1 Every wrong gives -1.25 So, steps can be formed from the combination of -1 and -1.25 only. => We can't have -0.25, -0.5, -0.75, -1.5, -1.75, -2.75 I'm getting six 'not possible' values. Pls correct me if I'm wrong. Tough question though!

How many four-digit natural numbers are there in which the sum of the first two digits equals the sum of the last two digits? A) 770 B) 670 C) 660 D) 615 E) 570 NOTE: It may not be a GMAT question.

There is a 5 x 5 square grid, with each of its cells having a distinct identity. In how many ways can three identical coins be placed in the grid (with at most one coin in each cell) such that no two coins are placed either in the same row or in the same column? A) 3600 B) 1800 C) 1200 D) 900 E) 600 Please provide explanation.

[clap] Thanks!

Find the sum of the series 1(2) + 2(2^2) + 3(2^3) + ... + 100(2^100). a) 100(2^101) + 2 b) 99(2^100) + 2 c) 99(2^101) + 2 d) 100(2^100) + 2 How to proceed with such questions?

Oh..got my mistake. Thanks cartman!

If in any decreasing AP, sum of all its terms, except for the first term, is equal to -36, the sum of all its terms, except for the last term, is zero, and the difference of the tenth and the sixth term is equal to -16, then what will be first term of this series? a) 16 b) 20 c) -16 d) -20 e) -24 Please provide explanation. Thanks!

[clap]Thanks Genius! That was very helpful.

Agreed that unit's digit in the sum is 6, but how can we deduce that the remainder is 6 when divided by 9??