A math formulas

Question 1

f^-1(x)

Answer 1

interchange x and y

Question 2

common difference

Answer 2

t2-t1

Question 3

tn

Answer 3

a+(n-1)d
ar^ (n-1)

Question 4

Sn (sum of first n number of terms in series)
in AM

Answer 4

n/2 (2a+(n-1)d)

Question 5

Arithmetic mean (AM)
polynomials

Answer 5

(a+b)/2

Question 6

2, 4, 6, 8

Answer 6

sequence

Question 7

2+4+6+8

Answer 7

series

Question 8

common ratio

Answer 8

t2/t1

Question 9

(AB)^-1

Answer 9

B^-1 A^-1

Question 10

adjoint of matrix A

Answer 10

swap main diag, change sign other diagnol

Question 11

inverse of matrix A

Answer 11

(1/A derterminant)*adj of A

Question 12

crfamers law

Answer 12

coeffn of x! coeffn of y! constant

Question 13

Q1

Answer 13

(N/4)
(n+1)/4

Question 14

Q2 or Median

Answer 14

(N/2)
(n+1)/2

Question 15

Q3

Answer 15

3N/4
3(n+1) / 4

Question 16

Formula of quadran in in continuoys/ grp series

Answer 16

L+(N/4-cf) * i/f

Question 17

coeffn of QD

Answer 17

(Q3-Q1)/ (Q3+Q1)

Question 18

correction factor

Answer 18

(lower limit of one class- ul of class before)/ 2

front term= -correction factor

back term= + correction factor

Question 19

mean

Answer 19

∑fX÷N

Question 20

MD from mean

Answer 20

∑f [X-mean]
/ N

Question 21

MD from mean coffn

Answer 21

MD frpm mean/ mean

Question 22

MD from Md

Answer 22

∑f [x-MD]
/N

Question 23

coffn of MD from MD

Answer 23

MD from Md/ Md

Question 24

Median

Answer 24

l + (n/2−cf)× i/f

Question 25

SD

Answer 25

SQR {(∑f x^2/ N) - (∑fx/N)^2}

Question 26

SD^2

Answer 26

variance

Question 27

coeffn of SD

Answer 27

SD/ mean

Question 28

coffn of variation

Answer 28

SD/mean * (100%)