Question

the product of (2,3) and (1,1) is?
(2,3)
(1,5)
(1,-5)
(-1,5)
2. cosec 2x - cot 2x = ?
secx
cosx
cotx
tanx

3. the limit of (x^2 - 4) / (x^2 - 2x ) as x tends to 2 is ?
0
2
-2
4

Answer 1

the arithmetic mean of 10 readings of a variable was 6.0 the following 4 readings were then added to the list 4,8,5,7. then the arithmetic mean of the new list of 14 readings is
16
8.4
4.1
6

Answer 2

for the second question your answer is 2. x^2-4 is the same as (x+2)(x-2) and in the denominator factor out the x to get x (x-2). now you can subtract the x-2 from numerator and denominator to get x+2/x, sub in 2 for x and you get 4/2...answer: 2

Answer 3

a,b,c are respectively the pth , qth and rth term of an arithmetic progression then p(b-c) + q(c-a) +r(a-b) = ?