Question

find the sum of 1+3+5+......+999 step by step​

Answer 1

Answer:

Step-by-step explanation:

first find out number of terms n

Tn=a+(n-1)d

here a=1, Tn=999, d=2

999=1+(n-1)*2

998=(n-1)*2

n=500

S=n/2(a+l)

S=500/2*(1+999)=250*1000=250000

Answer 2

Step-by-step explanation:

$tn = a + (n - 1)d \\ 999 = 1 + (n - 1)2 \\ 998 \div 2 = n - 1 \\ n = 500 \\ thenput \: formula \: of \: sn$