Question

Sunday given AP 8 ,10 ,12...
.find the sum of its last 10 terms it has a total of 6O terms​

Answer 1

Answer:

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Step-by-step explanation:

$sum \: = \frac{n}{2}(a + l) \\ = \frac{10}{2}(8 + 60) \\ = \frac{10}{2}(86) \\ x = 430$

Answer 2

Step-by-step explanation:

Tn = a+(n-1)d

T60= 8+(60-1)2

Sn=n/2[2a+(n-1)×2]