plz plz solve this very urgent
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1st term = 4-1/n
d = 4-2/n - (4-1/n) = -1/n
S = n/2 (2a + (n-1)d
Sum of n terms= n/2 (2×(4- 1/n)+(n-1)(-1/n)
= (7n-1)/ 2
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