Question

How
can we calculate the number
of terms in an arithmetic
sequence simply?
​

Answer 1

Answer:

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Step-by-step explanation:

we can use the tn formula

tn = a + (n - 1)d

Answer 2

Answer:

MARK AS BRAINLIEST ANSWER

Step-by-step explanation:

an = a+(n-1) d

Sn= n/2× (2a+(n-1) d)