Question

Q10-
Observe the pattern and fill in the blanks.
1 X 2
2 X3
1=1+2=
2
2
3X
1 +2 +3 =
2
(a) 1 + 2 + 3 +
(b) 1 + 2+ 3+ 4+ 5 =
X
ola​

Answer 1

Answer:

Clearly the pattern being followed is :

1+2+3+...+n=

2

n(n+1)

So,

here, n=10

Hence,

1+2+3+4+5+6+7+8+9+10=

2

10×11

=55