2012
Mathematics
JAMB
Evaluate n+1Cn-2 If n =15
A.
3630
B.
3360
C.
1120
D.
560
Correct Answer: 560
Explanation
n+1(n−2)/(n+1)! (n+1)+(n−2)!(n−2)!/(n+1)! (n+1)(n+1−1)(n+1−2)(n+1−3)/!3!(n−2)! (n+1)(n)(n−1)(n−2)/!3!(n−2)! (n+1)(n)(n−1/)3! Since n = 15 (15+1)(15)(15−1)/3! 16×15×14/3×2×1 = 560
n+1(n−2)/(n+1)! (n+1)+(n−2)!(n−2)!/(n+1)! (n+1)(n+1−1)(n+1−2)(n+1−3)/!3!(n−2)! (n+1)(n)(n−1)(n−2)/!3!(n−2)! (n+1)(n)(n−1/)3! Since n = 15 (15+1)(15)(15−1)/3! 16×15×14/3×2×1 = 560THIS WEEK's
Latest Articles
Top-Scorer Okoro Uchechukwu Solomon Reveals How He Scored 337 in JAMB
by samuel olalekan adeyemi
Bouncing Back: How Samuel Isaac Overcame Setbacks to Score 265 in JAMB and What He Learned
by samuel olalekan adeyemi
Managing Stress During Exams: Practical Tips for Students
by samuel olalekan adeyemi
