Answer: a=154 d=7 tñ=196 tn=a+(n-1)d 196=154+(n-1)7 42÷7=(n-1) 6+1=n n=7 sn=n/2(a+tn) sn=7/2(154+196) =7×175 =1225 Reply
Answer:
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Answer:
a=154 d=7 tñ=196
tn=a+(n-1)d
196=154+(n-1)7
42÷7=(n-1)
6+1=n
n=7
sn=n/2(a+tn)
sn=7/2(154+196)
=7×175
=1225