probability

karm karo phal ki ichha mat karo

try solving for the numbers to be in a.p
revised question: probability of the 3 numbers being in ap.
nice one.

@gordo

for a.p. probability:

P(required) = (18+8+5+3+2+2+1+1+1)/(20c3)
ans= 41/190

try these :

LEVEL I:

Q1. 10 NO'S ARE CHOSEN FROM AMONG THE NO'S 1-100 AND ARRANGED IN INCREASING ORDER . FIND THE PROBABILITY THAT 45 IS THE 5TH NO FROM LEFT IN THIS ORDER (REMEMBER THE ARRANGEMENT IS DONE IN INCREASING ORDER).

LEVEL II:

Q2. A WIRE OF LENGTH L IS CUT INTO THREE PIECES . FIND PROBABILITY THAT THESE PIECES FORM A TRIANGLE

LEVEL III: (NOT REALLY A LEVEL III QUESTION ...DEPENDS ON YOUR COMMON SENSE)

Q3. TWO CARDS ARE DRAWN FROM A PACK OF CARDS (A 52 CARD DECK).FIND PROBABILITY THAT ONE CARD IS HEART AND OTHER IS ACE.

Level 1 ans:
(44C4/100C10)*(1/46)

Level 3 ans:
probability of getting a heart or an ace=(13+3)/52=16/52=4/13

there some mistake in a.p. answer i gave the correct answer would be:

P(required)=(18+16+10+6+4+4+2+2+2)/(20c3)
= 64/190
=32/95

@ronak

in 3rd question u did the mistake what everyone does

oh sry i didn't c v had to draw two cards...

Level 3 ans:
16c2/52c2
=20/221

@ronak
no