Q. The number of selecting at least 4 candidates from 8 candidates is
A) 270
B) 70
C) 163
D) None of these
Explanation
(c)
Required number of selections
$= {\ ^{8}C}_{4} + {\ ^{8}C}_{5} + {\ ^{8}C}_{6} + {\ ^{8}C}_{7} + {\ ^{8}C}_{8}$
$= 70 + 56 + 28 + 8 + 1 = 163$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.