Question

Practic
1. First term and common difference of an
a = 6, d = 3, S = ?
27
n
S = 3 [+ (n-1) d]
(12 + (27-1)]
27
S =
27 2
27
XO
2
= 27 x 45 =​

Answer 1

Answer:

Given a=6d=3

S

27

=

2

n

[2a+(n−1)d]

S

27

=

2

27

[2×6+26×3]

=

2

27

[12+78]

=

2

27

[90]

=1,215

Answer 2

Answer:

1215 it is ans of this 27×45