Question

9. What is the sum of first 25 odd natural numbers?​

Answer 1

Answer:

this is given by formula

Sn= n/2 (a+l)

a = first term

l= last term

n= number of terms

Answer 2

Answer:

625

Step-by-step explanation:

1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+39+41+43+45+47+49=625