question: Find the invalid no.from the following series 13, 18, 25, 30, 37, 40
Options:
(A) 21
(B) 25
(C) 40
(D) 47
(E) 58
answer: Stream of consciousness: The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong. The answer is (C).

q: What is the units digit of the expression 14^717^4?
Options:
(A) 0
(B) 3
(C) 4
(D) 8
(E) 6
a: Stream of consciousness: I think answer on this one should be D too. Since we know that 14^7>17^4, as Will said one should always check if the number is positive. The answer is (D).

question: Efrida and Frazer who live 15 miles apart, meet at a restaurant that is directly north of Efrida's home and directly east of Frazer's home. If the restaurant is two miles closer to Efrida's home, than to Frazer's home, how many miles is the restaurant from Frazer's home?
Options:
(A) 6
(B) 7
(C) 8
(D) 10
(E) 13
answer: Stream of consciousness: It's a simple geometry problem. Look at the diagram below: The answer is (E).

q: The average of Suresh's marks in English and History is 55. His average of marks in English and Science is 65. What is the difference between the marks which he obtained in History and Science?
Options:
(A) 40
(B) 60
(C) 20
(D) Data inadequate
(E) None of the above
a: Stream of consciousness: E + H = (55 2) = 110;
E + S = (65 2) = 130
Reqd difference = 130 110 = 20 The answer is (C).

question: A and B complete a work in 8 days. A alone can do it in 14 days. If both together can do the work in how many days?
Options:
(A) 5 days
(B) 8 days
(C) 6 days
(D) 3.15 days
(E) 2.75 days
answer: Stream of consciousness: 1/8 + 1/14 = 11/56
56/11 = 5 days The answer is (A).

question: An analyst will recommend a combination of 3 industrial stocks, 2 transportation stocks, and 2 utility stocks. If the analyst can choose from 5 industrial stocks, 4 transportation stocks, and 3 utility stocks, how many different combinations of 7 stocks are possible?
Options:
(A) 12
(B) 19
(C) 60
(D) 180
(E) 720
answer:
Stream of consciousness: 5C3 * 4C2 * 3C2 = 10*6*3 = 180. The answer is (D).