Question

The first term of an A. P is 6 and the common difference 3 respectively
.Find S27
Sn =
2
[ + ( n- 1 )d ]
S27 = 27
2
[12+ ( 27-1) x ____ ]
=
27
2
x ____
= 27 x 45
S27 = ___

Answer 1

Answer:

1215

Step-by-step explanation:

Sn= n/2{2a+{n-1}d}

S27=27/2{2 x 6+{27-1}3}

=27/2{12+78}

= 27/2{90}

=27 x 45

So, sum of all the numbers of the given A.P. is 1215.

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