If 3^(x + y) = 81 and 81^(x – y) = 3, find the value of x.
A17/8
B15/8
C2
D5/2
Archive
Archives: MCQs
The product of two numbers is 2028 and their HCF is 13. How many such pairs of numbers are possible?
A1
B2
C3
D4
The perimeter of a rhombus is 40 cm and one of its diagonals is 12 cm. Find the area of the rhombus.
A48 cm²
B96 cm²
C120 cm²
D144 cm²
Simplify: (0.2 * 0.2 + 0.01) / (0.1 * 0.1).
A4
B5
C10
D25
Two dice are thrown simultaneously. What is the probability of getting a double (same number on both)?
A1/36
B1/12
C1/6
D5/36
If a + b + c = 9 and ab + bc + ca = 26, find the value of a^2 + b^2 + c^2.
A29
B31
C35
D41
In how many ways can the letters of the word ‘LEADER’ be arranged?
A180
B360
C720
D1440
Each interior angle of a regular polygon is 144°. How many sides does the polygon have?
A8
B9
C10
D12
Find the difference between compound interest and simple interest on Rs. 4000 at 10% per annum for 2 years.
ARs. 20
BRs. 30
CRs. 40
DRs. 50
Find the unit digit of 7^105.
A1
B3
C7
D9