Math, asked by beginsgame0, 11 months ago

Find the sum of the ap
5 + 12 + 19 + 26 ------- 145​

Answers

Answered by Suryapalsingh
1

Answer:

a=5

d=12-5 = 7

añ= 145

n=?

an= a+(n-1)d

145= 5+(n-1)7

145-5 = (n-)7

140 =(n-1)7

(n-1) = 140÷7

(n-1) =20

n-1=20

n=20+1

n=21

Answered by 19jainkhushi
0

Answer:

21

Step-by-step explanation:

145=5(n-1) (7)

145-5=7(n-1)

140=7(n-1)

20=n-1

n=21

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