Question

the sum of first n term of AP is given by sn​

Answer 1

When the sequence is an A.P,

Sn = sum of n number of terms.

n = number of terms

a= first term

d= common difference

an = nth term or last term.

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

or

Sn = n/2 [ a+ an ]

Answer 2

Step-by-step explanation:

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