The sum of first n terms of an ap is n2 5n .find the 25th term of an ap
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Use the sum of n terms of an AP: - If sum
of n terms of a sequence is given, then the
term
of the sequence can be determine by
and common difference,
Step 1 to 3
Given: - In an AP, the sum of first n terms is
.
To find: - The 18th terms,
Use the sum of n terms of an AP,
Given that the equation can be written as,
, (1)
substitute the value of n = 18 in equation (1),
The sum of 18 terms of the AP is 360.
Step-by-step explanation:
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