Question

Is 2020 be a term of the sequence 11,15,19.............?

Answer 1

Answer:

Given:-

• 11,15,19............are in AP
• L = 2020

To find:-

• is 2020 is the last term

Find:-

We know that:

L = a+(n-1)d

It is given that a=11 and d=(15-11)=4

2020 = 11+(n-1)4

2020= 11+4n-4

2020= 7+4n

2013 = 4n

n = 2013/4

As we know that n always will be in whole number and here it is in rational form and which is impossible

Hence, 2020 is not a term of AP 11,15,19...

Hope its help uh❤

Answer 2

Step-by-step explanation:

d=15-11=4

Tn=a+(n-1)×d

2020=11+(n-1)×4

2020-11=4n-4

2009=4n-4

2009+4=4n

2013=4n

n=2013/4

but n can't be in fraction so,

2020 is not the term of the sequence.....

HOPE IT HELPS YOU