Question

Find the 21st term of an AP 5,12,19,26

Answer 1

Step-by-step explanation:

Here,First term, a=5 Common Difference, d= 12-5 = 7

Suppose nth term of AP is 145

Now,

Tn= a+ (n-1)d

145 = 5+(n-1) (7)

145-5 = 7(n-1)

140 = 7(n-1)

20 = n-1

Therefore,

n = 21 .

Answer 2

Answer:

this is the correct answer...

aslamualaikum...

mark me as the brilliant....