If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is : – McqOptions

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1.	If an A.P. has a = 1, tn = 20 and sn = 399, then value of n is :
A.	0
B.	2
C.	8
D.	0
Answer» D. 0

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