How to find sum of a-p from the last term of ap

1.	How to find sum of a-p from the last term of ap
Answer» Jara tum dekho ki vaha sum hai ki nhi...?? Question whi pucha h dekbo Are yar amrit vo last term se nikalne ka formula hota hai?? L+(n-1)d N/2 (2a+(n-1)d)

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