Fence protects the Yard & Membrane protects the Cell.
Fence surrounds the Yard and allows the certain objects in & out of it whereas a Membrane surrounds the Cell & only allows specific nutrients inside of it.
A man is facing north-west. He turns in the clockwise direction, then in the anticlockwise direction and then another in the same direction. Which direction is he facing now?
As shown in fig. the man initially faces in the direction OP. On moving clockwise, he faces in the direction OX. On further moving anticlockwise, he faces in the direction OY. Finally, on moving anticlockwise, he faces in the direction OZ, which is South-east.
Clearly, alternatively we add and subtract 10% of a term to obtain the next term of the series. Thus, 10000 + (10% of 10000)= 11000; 11000 - (10% of 11000) = 9900; 9900 + (10% of 9900) = 10890; 10890 - (10% of 10890) = 9801. 9801 + (10% of 9801) = 9801+980 = 10781. So, missing term = 10890- (10% of 10890)= 9801.