Question

A.P, if t1=4 tn=28,Sn=64, find n​

Answer 1

Answer:

tn 7. sn 16

Step-by-step explanation:

28/4= 7 = TN

64/4= 16 = SN

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Answer 2

Answer:

28=4+(n-1)d

24=(n-1)d

64=n/2(8+(n-1)d

128= n(8+24)

128/32=n

4=n