Question

for an ap if t1=7,t13=79,what is s13​

Answer 1

Answer:

520

Step-by-step explanation:

Sn = $\frac{n}{2}$ (a+L)      a=First Value,   L=Last Value

S13= $\frac{13}{2}$ (1+79)

S13=  520

Answer 2

Ans 559 hai meko solution toh nhi pata lekin aapka answer Galt hai bhaiya