GMAT-HELP

1-4+9-16+...-100^2 Deduce the pattern => 1^2-2^2+3^2-4^2+...-100^2 =>(1^2-2^2)+(3^2-4^2)+...+(99^2-100^2) =>(1-2)(1+2)+(3-4)(3+4)+....+(99-100)(99+100) =>-3-7-11-15-19......-199 =>-1(3+7+11+15+....+199) =>-1(avg*no of terms) =>-1(((199+3)/2)*50) => -1*101*50 => -5050

1-4+9-16+...-100^2 Deduce the pattern => 1^2-2^2+3^2-4^2+...-100^2 =>(1^2-2^2)+(3^2-4^2)+...+(99^2-100^2) =>(1-2)(1+2)+(3-4)(3+4)+....+(99-100)(99+100) =>-3-7-11-15-19......-199 =>-1(3+7+11+15+....+199) =>-1(avg*no of terms) =>-1(((199+3)/2)*50) => -1*101*50 => -5050

Hats off to You! Good Luck!

Great Score! App for the top 5 schools! Good luck!

Skarya, I think 680 is a competitive score. You stand a good chance with a good application package in most of the good schools . Having said that, you are more likely to get your score to 700+ in your next attempt(without the timing jitters) if you decide to take that route. Good luck!

Great Score! Good luck with the E-MBA program.

Congrats! A very helpful debrief.. Good luck with ur apps.

Ans is D but the qn doesn't seem like a typical GMAT qn(If it is D, both stmts typically lead to the same unique ans): Please read thru' 800Bob's comments on a similar issue: http://www.www.urch.com/forums/gmat-data-sufficiency/50668-what-your-approach-question.html?highlight=remainder

Congrats GREMAT! Good luck with your apps.

Simple Interest: P is the principal;x is the interest rate P*n*x/100 = 10000*n*x/100 Ans C.

radius = r. Isn't it just sqrt(2)*r - px = r ? (from the centre of the circle draw a hor line which will be equal to the length r, apply pythagoras theorm) => r(sqrt(2) - 1) = 1 => r = 1/((sqrt(2) - 1) = sqrt(2) + 1 Circumference = 2*pi*r ~ 5pi Ans D.

5^x/5^y=? 1) xy=5 2) x+y=11 Qn stem: => 5^(x-y) = ? Stmt 1: Insufficient as unique values of x and y cannot be derived Stmt 2: Insufficient as unique values of x and y cannot be derived Combining both, (x-y)^2 = (x+y)^2 - 4xy => (x-y)^2 = 81 => x-y = (+/-) 9 => 5^(x-y) can be 5^9 or 5^-9 Insufficient Ans E.

Is x+y>0? 1). x/(x+y)>0 2). y/(x+y)>0 Stmt 1: Insufficient as x/(x+y)>0 with both numerator and denominator Stmt 2: Insufficient as y/(x+y) > 0 with both numerator and denominator Combining both, (x+y)/(x+y) > 0 => x+y can be -ve or +ve => Insufficient Ans E.

w, x, y & z are integers, w/x & y/z are integers => (wz + xy)/xz is an integer Is (wz + xy)/xz odd? Stmt 1: wx + yz is odd => one of them is odd and the other is even assuming wx is odd and yz is even => w/x is odd but y/z can be odd or even => w/x + y/z can be odd or even Insufficient Stmt 2: wz + xy is odd => (wz+xy)/xz is odd as only odd/odd can result in an integer (Qn stem: w/x & y/z are integers => (wz + xy)/xz is an integer) Sufficient Ans B.

Stmt 1: Counter example.. if y =5, RHS is 0 => x can be +5 or -5 to make x^2- y^2 = 0 => if x = +5, x^2 = xy; if x = -5; x^2 xy Insufficient Ans B. Another way to look at the qn stem: is x^2 = xy? => x^2-xy = 0? => x(x-y) = 0? => x = 0 or x = y..? Now it is easier to derive the ans..