No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
nn+2n
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
n2+n+1
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
n2+2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is Cn2+n+1 S=3+7+13+21+....t(n)→(1) S=3+7+13+.....t(n−1)+t(n)→(2) Subtracting (2) from (1) t(n)=3+4+6+8+12+.......2nt(n)=1+2+4+6+8+.......+20=1+2×n(n+1)2=1+n+n2