• #### NDA Exam Mathematics Study Material

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##### If the length of a rectangle in increased by 20% and width is decreased by 20%, then the area of the rectangle

a) Decreases by 20%
b) Decreases by 4%
c) Increases by 20%
d) Remains unchanged

a) Np
b) Np+2
c) N+p+1
d) N+p

a) B2 - a2
b) (a+b) /2
c) Ab
d) (a+b) / 2

a) I only
b) II only
c) I & III only
d) I and II only

a) 0.36%
b) 12.36%
c) 36%
d) 3.60%

a) 12/5
b) 5/12
c) 1
d) 12/7

a)
b)
c)
d)

a) 150°
b) 105°
c) 108°
d) 144°

a) -1
b) 0
c) 1
d) 1/√3

a) 3
b) 2
c) 0
d) 1