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First blank - we need a plural verb here to agree with the plural subject CELLS. The sentence talks about how the number of connections between the brain cells slowly die during the process of ageing. REDUCE and DECREASE can fit here. Diffuse - spread over a wide area or between a large number of people. Second blank - we need an adverb here to modify the verb WORK. The sentence talks about how some areas of the brain work less successfully. Both EFFICIENTLY and EFFECTIVELY will fit here. RELIABLE is an adjective.
Two schools, A and B participate in a Quiz competition. The probability of A’s winning is 3/7 and the probability of B’s winning is 3/5. Wha...
24 defective pens are accidentally mixed with 120 good ones. It is not possible to just look at a pen and tell whether or not it is defective. On...
A bag contains 3 black and 9 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?
...All the sides of a 3-inch solid cube are painted. The cube is then cut into cubes of equal size to 1 inch each. If a cube is chosen at random, what is t...
The probability of selecting a rotten apple randomly from a heap of 100 apples is 0.20. What is the number of rotten apples in the heap?
...A bag contains 5 red books, 7 yellowbooks and 7 greenbooks . 3books are drawn randomly. What is the probability that the
A person has two vessels (A & B) that contain white and blue balls. In the Vessel 'A' there are 8 white and 8 blue balls and, in the Vessel, 'B' there a...
The probability of selecting a rotten apple randomly from a heap of 1050 apples is 0.36. What is the number of rotten apples in the heap?
In a bag, there are 7 red balls, 5 black balls, and 9 green balls. If two balls are selected at random, what is the likelihood of picking one red ball a...
A bag contains 19 white and some black balls. If the probability of drawing a black ball from the bag is twice that of drawing a white ball, find the nu...