Find the area of circle having radius `2 m`

Answer

B

Explanation

Statement 1 Let S be the required sum of product of numbers.
`(sum_(i=1)^(n)x_(i))^(2)=sum_(i=1)^(n)x_(i)^(2)+2sum_(1leiltjlen)sumx_(i)x_(j)`
`:.(a_(1)-a_(1)+a_(2)-a_(2)+"...."+a_(n)-a_(n))^(2)=2sum_(i=1)^(n)a_(i)^(2)+25`
`:. S=-sum_(i=1)^(n)a_(i)^(2)`
`:.` Statement 1 is true.
Statement 2 is true but not correct explanation for Statement 1.