The letters decrease by 1; the numbers are multiplied by 2. therefore answer is E4

Find a number which is Divided by 2 the balance should be 1, div by 3 bal 2, div by 4 bal 3, div by 5 bal 4, div by 6 bal 5, div by 7 bal 0, div by 8 bal 7.

Fill in the blank spaces with the appropriate number.

1) 6 , 5 , 43.2 2) 5 , 4 , 31.25 3) 4 , 3 , 21.33 4) 3 , 2 , ?