Exam Notifications
20 May
20 May 2020
6 May 2020
Concepts
06 May
Prime Numbers
Prime Numbers
Definition of Prime Number
Prime number is a number which has only two factors 1 and the number itself
Examples: 2 = 1×2, 3=1×3,5=1×5,7=1×7,....
etc.
⊹ 1 is neither a prime nor a composite number.
⊹ 2 is the smallest prime number.
⊹ Greatest two digits prime number is 97
⊹ Greatest two digits prime number is 97
How many prime numbers from 1 to 100?
25 prime numbers from 1 to 100.
The prime numbers are
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97
How many prime numbers from 1 to 200?
46 prime numbers from 1 to 200The prime numbers are
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199
Twin Primes Number
Two prime numbers whose difference is 2 are called twin primes.
For examples 3 and 5 are twin primes numbers since difference between 5 and 3 is 2.
How many pairs of twin primes numbers from 1 to 100 ?
8 pairs of twin primes from 1 to 100
The pairs of twin primes numbers are
(3,5);(5,7);(11,13);(17,19);(29,31);(41,43);(59,61);(71,73)
3 May 2020
Solutions
03 May
Prove that sin^2(6x)-sin^2(4x)=sin2x sin10x
Prove that sin^2(6x)-sin^2(4x)=sin2x sin10x
2 May 2020
18 Apr 2020
Solutions
18 April
Ganit Prakash Class IX Bengali Solution
Ganit Prakash Class IX Bengali Solution/
WBBSE Class 9 math bengali solution
27 Feb 2020
Solutions
27 February
If tanA=(2x-k)/ksqrt(3) and tanB=xsqrt(3)/(2k-x) then show that |B-A|=30 degree
If tanA=(2x-k)/ksqrt(3) and tanB=xsqrt(3)/(2k-x) then show that |B-A|=30 degree
Download the pdf click the link below
download here
Solutions
27 February
If tanA=xsinB/(1-xcosB) and tanB=ysinA/(1-ycosA) then show that sinA/sinB=x/y
If tanA=xsinB/(1-xcosB) and tanB=ysinA/(1-ycosA) then show that sinA/sinB=x/y
Download the pdf click the link below