73+75+77+79+81+83+85+87+89
Answers
Answered by
15
Answer:
729
Step-by-step explanation:
hope it helps u
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Answered by
0
Answer:
a=73, d=75-73=2
tn= a+(n-1)d
= 73+(n-1)2
= 73+ 2n-2
= 71+2n
Sn= n/2 {a+tn}
= n/2 {73+89}
=n/2 (162)
= 81 n
Step-by-step explanation:
sorry not getting it
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