Question

200 logs are are arranged as 20 logs in first row then 19 in next then 18 and so on in how many rows 200 logs are placed ​

Answer 1

Answer:

181

Step-by-step explanation:

By the formula of A.P

Tn = a+(n-1)d

a= 20 ,  d= 20-19= 1  ,   Tn = 200

Tn = a+(n-1)d

200 = 20+(n-1) 1

200 = 20 + n - 1

200-20+1 = n

⇒ N = 181