Question

Find the sum of first 22nd terms of AP in which d=7 and 22nd term is 149

Answer 1

Answer:

an= 149

a = ?

d = 7

n = 22

an = a + (n-1)d

149 = a + (22-1)7

149 = a + 21*7

149 = a + 147

149-147=a

a= 2

a22 = a+(n-1)d

a22 = 2+(22-1)7

a22 = 2+147

a22 = 149

Answer 2

Answer:

Hope this helps!

Step-by-step explanation:

First you find out the value of "a" which is the first term.

Then you apply you formula for sum of terms(Sn)