Question

In AP the first term is 'a' and the last term is a then write the formula for sum
of n terms​

Answer 1

Answer:

Sum of n terms is A.p

Therefore, Sn= n/2 ( 2a+(n-1) d)

OR Sn= n/2 ( a+ tn)

HOPE THIS HELPS YOU

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Answer 2

Answer:

Sn = n/2[2a+(n-1)d]

Step-by-step explanation:

common difference = d

first term = a

last term = an

==> Sum of AP :

$= \frac{n}{2} (2a + (n - 1)d)$

OR

$= \frac{n}{2} (a + an)$

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Hope it helps.....!

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