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Vijay Singh chauhan Asked a Question
June 21, 2022 4:54 pmpts 30 pts
SU O istn progression s last ftm DeYy progression s last ftm DeYy
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  • Navdeep goyal 1 Best Answer
    by formula of nth term of AP l=a+(n-1)d. where l last term and a first term Sum of n terms S=(n/2){2a+(n-1)d} =(n/2){a+a+(n-1)d} =(n/2){a+l}
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