Asked by Ab
SN=1+5+9+(N=15)
Answers
Answered by
oobleck
since a=1 and d=4,
Sn = n/2 (2+(n-1)*4) = n/2 (4n-2) = n(2n-1)
Sn = n/2 (2+(n-1)*4) = n/2 (4n-2) = n(2n-1)
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