Demoniator ko dekho 4==1^2*2^2 36==2^2*3^2 144==3^2*4^2 Series bnegi Jisme common diff ==1 h 1-1/2^2+1/2^2-1/3^2+......1/9^2-10^2 1-1/10^2====1-1/100===0.99 20 views°•✮•° Virat °•✮•°, 09:23