Question

what is the sum of first twenty one odd natural number​

Answer 1

Answer:

441

Step-by-step explanation:

the first 21 odd numbers are :

1,3,5,7,9,11,13,15,17,19,21,23,25,27,29,31,33,35,37,39,41

There sum is

1+3+5+7+9+11+13+15+17+19+21+23+25+27+29+31+33+35+37+,39+41=441