Question

please send the attachment with steps briefly

Answer 1

Answer:

Option iii : - atmost 3 boys. :)

Answer 2

Step-by-step explanation:

8 girls 4 boys

i) exactly 3 boys =

selecting 3 boys from 4 = 4c3

remaining 4 members are girls

selecting 4 from 8 girls = 8c4

4c3×8c4 = 4×8c4

ii) atleast 3 boys =no. of boys in committee =3 or 4

no. of boys in committee =4:

selecting 4 boys = 4c4

remaining 3 from 8 = 8c3

4c4×8c3 = 1×8c3 = 8c3

no. of boys in committee =3:

from (i) = 4×8c4

total = 8c3 +4×8c4

iii) atmost 3 boys = committee in boys = 0,1,2,3

= total- committee with 4 boys

total = 8+4 =12

committee of 7 from 12 = 12c7

=12c7- 8c2