Sum of series 1/2 + 1/3 + 1/6+....,.. to 9 terms is
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Step-by-step explanation:
her A= 1/2 d= 1/3-1/2= 2-3/6= -1/6
n= 9
we know that sn= n/2(2a+(n-1) d
=9/2(2×1/2+(9-1)-1/6
= 9/2(2+(8×-1/6)
= 9/2(2-8/6)
= 9/2(12-8/6)
9/2(4/6)
= 9/2×2/4
= 18/8 or 9/4
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