Question

find the sum of the first 25 odd natural number​

Answer 1

Answer:625

Step-by-step explanation:

1,3,5,7.....

a=1

d=3-1=2

Sn=n/2[2a+(n-1)d]

S25=25/2[2(1)+24(2)]

     =25/2[2+48]

     =25/2[50]

     =25(25)

      =625

Answer 2

Heÿ

Solution


What is Ødd Number ?


A number which are not divisible by 2


Question => Sum of first 25 number


=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


Therefore, 625 is the sum of first 25 odd numbers.


Answer : 625


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