Question

QUAL O VIGÉSIMO QUINTO TERMO DA P .A.(2,5,8,...)?

Answer 1

$a_{n}= a_{1}+ (n-1).r \\ a_{25}= 2+ (25-1). (5-2) \\ a_{25}= 2+ 24.3 = 2+ 72= <strong><em>74</em></strong>$

Answer 2

an= ?

a1= 2

n= 25

r= 5 - 2 = 3

a25= 2 + (25 - 1) • 3

a25= 2 + 24 • 3

a25= 2 + 72

a25= 74