Q. In a harmonic progression, if the first term is 2 and the second term is 3, what is the third term?
A.4
B.5
C.6
D.7
Solution
In a harmonic progression, the reciprocals of the terms form an arithmetic progression. The reciprocals of 2 and 3 are 1/2 and 1/3. The common difference is 1/3 - 1/2 = -1/6. The third term's reciprocal will be 1/3 - 1/6 = 1/6, so the third term is 6.
Q. In a harmonic progression, if the first term is 2 and the second term is 4/3, what is the third term?
A.1
B.3/2
C.2/3
D.1/2
Solution
In a harmonic progression, the reciprocals of the terms form an arithmetic progression. The reciprocals of the first two terms are 1/2 and 3/4. The common difference is 1/4, so the reciprocal of the third term is 1/2 + 1/4 = 3/4. Therefore, the third term is 1/(3/4) = 4/3.
Q. In a harmonic progression, if the first term is 4 and the second term is 2, what is the common difference of the corresponding arithmetic progression?
A.1
B.2
C.3
D.4
Solution
The reciprocals of the terms are 1/4 and 1/2. The common difference is 1/2 - 1/4 = 1/4.
Q. In a harmonic progression, if the first term is 4 and the second term is 8, what is the common difference of the corresponding arithmetic progression?
A.1
B.2
C.3
D.4
Solution
The reciprocals are 1/4 and 1/8. The common difference is 1/8 - 1/4 = -1/8, which means the common difference of the corresponding arithmetic progression is 1/8.
Q. In a harmonic progression, if the first term is 4 and the second term is 8, what is the third term?
A.12
B.16
C.20
D.24
Solution
The reciprocals are 1/4 and 1/8. The common difference is 1/8 - 1/4 = -1/8. The third term's reciprocal will be 1/8 - 1/8 = 0, hence the third term is 16.
Q. In a harmonic progression, if the first term is a and the second term is b, what is the formula for the nth term?
A.1/(1/n + 1/a)
B.1/(1/n + 1/b)
C.1/(1/a + 1/b)
D.1/(1/a - 1/b)
Solution
The nth term of a harmonic progression can be expressed as 1/(1/a + (n-1)d) where d is the common difference of the corresponding arithmetic progression.
Q. In a knockout tournament, if there are 16 teams, how many matches are required to determine the winner?
A.15
B.16
C.14
D.8
Solution
In a knockout tournament, the number of matches required to determine a winner is always one less than the number of teams. Therefore, for 16 teams, 16 - 1 = 15 matches are needed.
Q. In a linear arrangement of five friends A, B, C, D, and E, if A is to the left of B and C is to the right of D, which of the following must be true?
A.A is to the left of C
B.D is to the right of A
C.B is to the left of D
D.E is in the middle
Solution
Since A is to the left of B and C is to the right of D, we cannot definitively place E without additional information. However, A being to the left of C is a possible arrangement.
Q. In a linear arrangement of four people P, Q, R, and S, if P is sitting next to Q and R is sitting at one end, which of the following is a possible arrangement?
A.R, P, Q, S
B.S, R, P, Q
C.Q, P, R, S
D.P, S, R, Q
Solution
R can be at one end, and P must be next to Q, making R, P, Q, S a valid arrangement.