1+2+3+......+n=n(n+1)/2
Answers
Answered by
2
Answer:
C
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
IC
H
I
N
T
U
B
H
A
I
Similar questions