Question

Which is the product of prime number between 1 and 20?

Answer 1

Answer:

9699690 is the product of all prime numbers between 1-20

Answer 2

Step-by-step explanation:

2,3,5,7.....19

they formed an A.P

a=2

d=3-2=1

tn= 19

an general formula for

tn=a+(n-1)d

19=2-(n-1)1

19-2=(n-1)1

17=(n-1)1

17÷1=(n-1)

17+1=n

18=n

sn=n/2[2a(n-1)d]

s18=18÷2[2×2(18-1)1]

=9×68

=612

Ans:The product of prime number between 1 to 20 is 612