GRE QUANT ALGEBRA, PROBABILITY
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1) The last digit of 5033,813,273,93,33,54,32,1 is 9 based on the pattern that the last digits of multiples of 4 are 6, 2, 8, and 4. 2) Quantity A is 72. The number of positive integers less than 81 that are not perfect squares is 72, since there are 8 perfect squares between 1 and 81. 3) The probability that managers A and B are both selected from a group of 5 managers where 2 people are randomly selected to attend a conference is 1/10.
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GRE QUANT ALGEBRA, PROBABILITY
- 2. What is the unit’s digit of 50 3 3433 ,813 ,273 ,93 ,33 5 4 3 2 1 The last digits are 3, 9, 7,1 There is a pattern in multiples of 4 Question 1
- 3. 24850 333 Last digit is 9
- 4. S consists of all positive integers < 81 that are not equal to the square of an integer Quantity A Number of integers in S Quantity B 72 Positive integers < 81 that are perfect squares are 1, 4, 9, 16, 25, 36, 49, 64 Question 2
- 5. These are 8 in number 80 – 8 = 72 The 2 quantities are equal
- 6. From a group of 5 managers, 2 people are randomly selected to attend a conference. What is the probability that A and B are both selected Prob = no of favourable outcomes/ total number of outcomes There is only 1 way of selecting A and B Question 3
- 8. Question 4 If a# b = a + b, what is ( 2 # 3 ) # 2 5+2 = 7
- 9. Question 5 1## 2 xx What is # 3 # - (# 2 #) = 5)12()13( 22 *******************