Andrew Geller

Andrew Geller is a top GMAT tutor based out of New York City. Throughout his career he has successfully taught people from many different backgrounds, countries, and starting scores.

Team A and Team B are competing against each other in a game of tug-of-war. Team A, consisting of 3 males and 3 females, decides to line up male, female, male, female, male, female. The lineup that Team A chooses will be one of how many different possible lineups?

Team A and Team B are competing against each other in a game of tug-of-war. Team A, consisting of 3 males and 3 females, decides to line up male, female, male, female, male, female. The lineup that Team A chooses will be one of how many different possible lineups? A. 9 B. 12 C. 15 D. 36 E. 720 Correct Answer:

A sequence of numbers a₁, a₂, a₃, . . . is defined as follows: a₁ = 3, a₂ = 5, and every term in the sequence after a₂ is the product of all terms in the sequence preceding it, e.g., a₃ = (a₁)(a₂) and a₄ = (a₁)(a₂)(a₃). If a_n = t and n > 2, what is the value of a_n+2 in terms of t?

A sequence of numbers \( a_1, a_2, a_3, \dots \) is defined as follows: \( a_1 = 3 \), \( a_2 = 5 \), and every term in the sequence after \( a_2 \) is the product of all terms in the sequence preceding it, e.g., \( a_3 = (a_1)(a_2) \) and \( a_4 = (a_1)(a_2)(a_3) \). If \( a_n = t

A sequence of numbers a₁, a₂, a₃, . . . is defined as follows: a₁ = 3, a₂ = 5, and every term in the sequence after a₂ is the product of all terms in the sequence preceding it, e.g., a₃ = (a₁)(a₂) and a₄ = (a₁)(a₂)(a₃). If a_n = t and n > 2, what is the value of a_n+2 in terms of t? Read the Full Article »

Of the 150 houses in a certain development, 60 percent have air-conditioning, 50 percent have a sunporch, and 30 percent have a swimming pool. If 5 of the houses have all three of these amenities and 5 have none of them, how many of the houses have exactly two of these amenities?

Of the 150 houses in a certain development, 60 percent have air-conditioning, 50 percent have a sunporch, and 30 percent have a swimming pool. If 5 of the houses have all three of these amenities and 5 have none of them, how many of the houses have exactly two of these amenities? A. 10 B. 45 C. 50 D. 55

In a box of 12 pens, a total of 3 are defective. If a customer buys 2 pens selected at random from the box, what is the probability that neither pen will be defective?

In a box of 12 pens, a total of 3 are defective. If a customer buys 2 pens selected at random from the box, what is the probability that neither pen will be defective? A. 1/6 B. 2/9 C. 6/11 D. 9/16 E. 3/4 Correct Answer: C You’ll find tons of practice questions, explanations for

In a box of 12 pens, a total of 3 are defective. If a customer buys 2 pens selected at random from the box, what is the probability that neither pen will be defective? Read the Full Article »

The letters D, G, I, I, and T can be used to form 5-letter strings such as DIGIT or DGIIT. Using these letters, how many 5-letter strings can be formed in which the two occurrences of the letter I are separated by at least one other letter?

The letters D, G, I, I, and T can be used to form 5-letter strings such as DIGIT or DGIIT. Using these letters, how many 5-letter strings can be formed in which the two occurrences of the letter I are separated by at least one other letter? A. 12 B. 18 C. 24 D. 36

Andrew Geller

Team A and Team B are competing against each other in a game of tug-of-war. Team A, consisting of 3 males and 3 females, decides to line up male, female, male, female, male, female. The lineup that Team A chooses will be one of how many different possible lineups?

A sequence of numbers a1, a2, a3, . . . is defined as follows: a1 = 3, a2 = 5, and every term in the sequence after a2 is the product of all terms in the sequence preceding it, e.g., a3 = (a1)(a2) and a4 = (a1)(a2)(a3). If an = t and n > 2, what is the value of an+2 in terms of t?

Of the 150 houses in a certain development, 60 percent have air-conditioning, 50 percent have a sunporch, and 30 percent have a swimming pool. If 5 of the houses have all three of these amenities and 5 have none of them, how many of the houses have exactly two of these amenities?

In a box of 12 pens, a total of 3 are defective. If a customer buys 2 pens selected at random from the box, what is the probability that neither pen will be defective?

The letters D, G, I, I, and T can be used to form 5-letter strings such as DIGIT or DGIIT. Using these letters, how many 5-letter strings can be formed in which the two occurrences of the letter I are separated by at least one other letter?