Question

Find how many terms in the given series: 2,4,6,.....80.

Answer 1

Answer:

Here, a = 2 , d = 2 ,

${tn}^{th} term \: = 80$

tn = a + (n - 1)d

80 = 2 + (n - 1)× 2

80 = 2 + 2n - 2

80 = 2n

$n = \frac{80}{2}$

n = 40

Therefore, there are 40 terms in the given AP!