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Simplify: (0.3 * 0.3 + 2 * 0.3 * 0.7 + 0.7 * 0.7).
A0.49
B0.81
C1.00
D1.21
A radius of a circle is increased by 20%. By what percentage does its area increase?
A40%
B42%
C44%
D48%
The compound interest on Rs. 5,000 for 2 years at 10% per annum compounded annually is:
ARs. 1,000
BRs. 1,050
CRs. 1,100
DRs. 1,050
A box contains 4 red cards and 6 black cards. Two cards are drawn one after another without replacement. What is the probability that both are red?
A2/15
B4/25
C2/9
D3/10
The average age of 30 students in a class is 15 years. If the teacher’s age is included, the average increases by 1 year. What is the teacher’s age?
A44 years
B46 years
C48 years
D50 years
Find the variance of the first 5 natural numbers (1, 2, 3, 4, 5).
A1.5
B2.0
C2.5
D3.0
If x : y = 3 : 4, find the value of (5x – 2y) : (7x + 2y).
A7 : 29
B7 : 23
C5 : 29
D11 : 23
In how many different ways can the letters of the word ‘LEADER’ be arranged?
A180
B360
C720
D1440