Question

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14. Sum of n terms of an AP when last term is not known is given by_______​

Answer 1

Answer:

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

Where n is number of terms,a is first term and d is common difference.

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Answer 2

Answer:

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

Step-by-step explanation:

where a is the 1st term

n is the number of terms

d is the common difference