Question

Find the sum of all the 11 terms of an ap whose middle most term is 30

Answer 1

Heya user,

ATQ -->

Middle most term is 30 --------->

.'. let the AP be of 11terms, such that The middlemost term is 30

Then  --->
( 30 - 5d ), ( 30 - 4d ), ( 30 - 3d ) .... , 30, ( 30 + d ), ..., ( 30 + 5d )

.'. Sum of 11 terms = 11 * 30 = 330;

One can take such an AP in various ways...... 
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