self Maths Puzzle

there are 2 bulbs.. there is a critical height from which if we drop the bulb then it will break. below this height the bulb will not break.. determine minimum no. of times you will drop the bulb to succesfully find out the critical height such that critical height is less then 38 and greater then 0..

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self Other Question

if
ABCD
* E
_____
DCBA

find the value of A,B,C,D,E
use 4 for four times and bring the answer 4.