1.2+2.3+....+n(n+1) = n(n+1)(n+2) / 3

Sum of 3 + 3^2+ 3^3 +.....+3^n = 3 ( 3^n - 1)

2+4+6+8+.....+2n = n ( n+1 ) or Sum of even numbers is equal to 2n(n+1)

1+2+3+.......+n = n(n+1)/2

nsquare + n is even

9^n - 1 is divisible by 4

6^n - 1 is divisible by 5

4^n - 1 is divisible by 3

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SEE model question set 5 ,Q.no :28 ( 10 sets -081 ) || Mean Deviation|| Special case.

Ex:16A,Q.no : 4 (e to g ) ,Chap:16 :Differentiation |Derivative | @rahulsarraf9800

Ex: 16A ,Q.no : 4 ( from a to d ) , Differentiation || Derivative,@rahulsarraf9800

Standard Deviation,by step deviation method ,@rahulsarraf9800

Find Derivative: Differentiation | Grade 11 | Ex :16 A Q.no : 3 all ,@rahulsarraf9800

Find the differential coefficient of x^5 , cube root x , | Ex : 16 A, Q.no: 2 all@rahulsarraf9800

Derivative from the first principle |Ex,16A ,Q.no 1 ,s and t . Differentiation | @rahulsarraf9800

Derivative from the first principle | Differentiation,Ex :16 A ( from r to t ) ,@rahulsarraf9800

Standard deviation by short cut method | @rahulsarraf9800

Derivative from the First principle | Ex: 16 A ,Q.no : 1 ( o to q ), @rahulsarraf9800

Derivative from the first principle || Ex : 16 A ,q.no 1 , (k to q ),@rahulsarraf9800

Derivative from first principle | basic mathematics| Ex:16 (A)

Differentiation,derivative from the first principle, Basic math . Ex : 16 (A) | @rahulsarraf9800

Standard deviation | by Actual mean method @rahulsarraf9800

Standard deviation|| By direct method || @rahulsarraf9800

Mean Deviation from Median || @rahulsarraf9800

Mean Deviation from mean || @rahulsarraf9800

How to convert inclusive series into Exclusive series . @rahulsarraf9800

Quartile Deviation @rahulsarraf9800

Find the equation of the sides of right angled isosceles triangle . @rahulsarraf9800

Find the equation of the sides of an equil. triangle whose vertex is(1,2) and base is y = 0.

Find the equation of the st. lines passing through (3,-2) and making an angle of 45° with 6x-7y-5=0.

Stomata

Transpiration in a plants

Find the equation of the perpendicular bisector of the line joining two points ( 5,7 ) and ( 4, 5 ).

Find the equation of the straight line parallel to the line 2x - 3y + 4 = 0 and passing through mid

Find the equation of the straight line passing through the ( -2 , 5 ) and perpendicular to the ...

Find the equation of the straight line perpendicular to the line 2x - 3y + 4 = 0 and passing...

If the lines 3x + 4y -7 = 0 and kx -3y + 5 = 0 are perpendicular to each other. Find the value of K.