What is the units digit of (303^33) – (73^15)? A. 4 B. 5 C. 6 D. 7 E. 8 [spoiler]C.[/spoiler] Solution: When integers are multiplied by themselves they follow a repeating pattern. 3, 3*3, 3*3*3, 3*3*3*3 then it repeats 3*3*3*3*3 – 3, 9, 27, 81, 243. The units digit pattern of 3 is 3, 9, […]
GMAT Question of the Day – Number Properties – April 24th Read the Full Article »
(If you are just getting started you might want to start with the intro to the GMAT Study Schedule) GMAT Study Guide: Week 5 Things are getting serious in this GMAT Study Guide:) We are reaching the halfway point. The good news is that you should be seeing some improvement. Most of what the GMAT
GMAT Study Guide: Week 5 Read the Full Article »
How many even multiples of 3 are there between 127 and 390? A. 41 B. 42 C. 43 D. 84 E. 85 [spoiler]C.[/spoiler] Solution: Find the first and last even multiples of 3 within the range: 132 and 384. Find the number of numbers in the range (inclusive) 384-132 + 1 = 253. Divide that
GMAT Question of the Day – Number Properties – April 23rd Read the Full Article »
If f(x) is defined as the largest integer k such that x is divisible by 3^k, which of the following has the greatest value? A. f(9) B. f(24) C. f(32) D. f(62) E. f(93) [spoiler]A.[/spoiler] Solution: What is this question really asking? Which of the following has the most 3’s as factors. 9 has two
GMAT Question of the Day – PS Exponents – April 22nd Read the Full Article »
What is the value of x? (1) x^6 = |x| (2) x^3 = x [spoiler]E.[/spoiler] Solution: Statement (1): This tells us that x must be 1, -1, or 0. No other number will satisfy this equation. Insufficient. Statement (2): This also tells us that x must be 1, -1, or 0. Insufficient. Statement (1) +
GMAT Question of the Day – DS Exponents – April 21st Read the Full Article »
