COMPLICATED EXCEL FORMULA

Hello Friends,

Can any one help me to sove my problem. I have two excel sheets . i want to comapre column A and B with other sheet and if both cells in sheet 1 matches eaxactly with sheet 2 then return the 3rd adjacent cell to sheet 1.

Here are the sheets,

Sheet 1
A B C
Density Viscosity NUMBER

0.457 3.55 = PUT FORMULA HERE
0.525 3.25
0.606 1.95
0.835 1.95
0.675 2.75
0.746 2.57
0.835 2.38
0.946 2.17
0.457 2.17

Sheet 2

Density Viscosity NUMBER

0.457 3.55 500
0.525 3.25 400
0.606 1.95 300
0.675 2.75 250
0.746 2.57 200
0.835 2.38 150
0.457 2.17 100
1.29 1.71 10
0.835 1.95 50

Expected Result

sheet 1

A B
Density Viscosity NUMBER

0.457 3.55 500
0.525 3.25 400
0.606 1.95 300
0.835 1.95 50
0.675 2.75 250
0.746 2.57 200
0.835 2.38 150
0.946 2.17 NA
0.457 2.17 100


please find a formula ..

Thank you