diode is a two terminal device. It allows current to flow only in one direction.
n(r)=38
n(b)=20
n(r & b) = 13
n(r+b) = n(r)+n(b)-n(r&b)
= 38+20-13
= 45 (flags with either red or blue)
total flags(study) = 45 + 8(neither red nor blue) = 53
red not blue = 38-13 = 25
blue not red = 20-13 = 7
reduced by 20%=80%
(20/80)*100=25%
Try trial and error method for the multiple numbers of 7
you will get a number 119 which should get a remainder 6 when divided by 7,5 when divided by 6,4 when divided by 5,3 when divided by 4,2 when divided by 3,1 when divided by 2,
8. If a man stands in front of sun what is the first letter of the direction which is left to him?
its a kind of trick question ....as sun can be considered as
a sphere of burning gases and not a circle...so it can be
any direction on the left of person standing in front of the
sun.
9. Success is to failure as joy is to?
joy is to sorrow