1.

Find the Sum of first 25 terms of an arithmetic sequence 5, 8 , 11 , 14 ,...​

Answer»

Answer:

1025

Step-by-step explanation:

\frac{<klux>N</klux>}{2}  \times (2a + (n - 1)d)

here

n MEANS 25

a means 5

d means 3



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