Question

फाइंड द सम ऑफ द ओल्ड नंबर बिटवीन 0 एंड 50​

Answer 1

Step-by-step explanation:

odd no. between 0 to 50.

1,3,5,7,9,.......................49.

a=1

d=3-1=2

tn=49

n=?

by using formula,

tn=a+(n-1)d

49=1+(n-1)2

49-1=2n-2

48=2n-2

48+2=n

n=50

find sum of 50 terms

Sn=n/2[t1+tn]

S50=50/2×[1+49]

S50=50/2×50

S50=25×25

S50=625

sum of first 50 odd terms is 625.