Question

find the number of terms in each of the followsing AP's
(1) 7. 13, 19,---205​

Answer 1

Answer:

a= 7 d = a²-a¹ an = 205

= 13-7

=6

an = a +(n-1) d

205 = 7+(n-1)6

205 = 7+6n-6

205-1= 6n

$\frac{204}{6}$

n = 34

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