Question

2) Find the number of terms in the following

a) 1+2+3+………= 1275
b) 1+4+7+………= 590

Arithmetic equation ​

Answer 1

Answer:

1269

572

okay.....,......

Answer 2

+x = 590. 1,4,7,10, ...is an A.P. first term (a) = 1. common difference (d) = a2-a1. = 4-1. d = 3. i ) Let sum of 'n' terms= Sn. S_{n}=\fr