IIT JEE , AIEEE Forum - Mathematics , Algebra

ashok_p_ap

4. assertion: The integral part of (8+3?7)²⁰ is an odd integer.

Reason : (8+3?7)²⁰+(8+3?7)²⁰ is an even integer.

2. lim (cos^-1x)²

xà1- ---------- Ans.4

1-?x

1.10 identical coins are distributed among 6 persons at random. The probability that at least one will receive none is?

Ans. 137/143

elastiboysai

clarify the symbols plz

u mean root?

elastiboysai

sboosy

Required probability=

1- P(each getting atleast one)

P(each getting atleast one)=

n(event)/n(sample)

n(event):

a+b+c+d+e+f=10 where each greater than or equal to 1

= (10-1)C(6-1)

n(sample):

a+b+c+d+e+f=10 where each greater than or equal to 0

10+6-1C6-1

1-[n(e)/n(s)]

=137/143

elastiboysai

elessar_iitkgp

Good work everyone