Ravi
•31/2x31/4x31/8x31/16x…...........upto infinty
•31/2 +1/4+1/8+1/16 +1/32 …...........
•Now, 1/2 +1/4+1/8+1/16 +1/32+... is an infinite series with
common ratior= (1/4)/(1/2)= (1/2)
•So, the sum of an infinite GP with r<1 is S(inf.)= a/(1-r)
•Hence, Series S:31/2 +1/4+1/8+1/16 +1/32 ….......... = 3[(1/2)/(1-r)]
•S= 3[(1/2)/(1-(1/2))]
•S= 3[1]
•S=3