self Maths Puzzle

use 4 for four times and bring the answer 4.

Read Solution (Total 5)

4+4*(4-4) here 4-4=0 multiplied by 4=0 +4 so the ans
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4^0+4^0+4^0+4^0=
1+1+1+1
4
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4!-4-4*4=4
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4*4pow(4-4)
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4-4*4+4
Explaina: 4-4 =0 0*4=0 0+4=4
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self Other Question

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.. A number when divided by D leaves a remainder of 8 and when divided by 3D leaves a remainder of 21 . What is the remainder left, when twice the number is divided by 3D?
a) 13 b) cannot be determined c) 3 d) 42