Question

प्रथम 20 सम संख्याओं का औसत क्या होगा ?​

Answer 1

Step-by-step explanation:

as we know

avg = sum of obs/ no of obs

= 1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20/20

= 110/20

= 5.5

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Answer 2

Answer:

formula=x(x+1)

Step-by-step explanation:

=20(20+1)

=20*21

=420

This is short way..

Thankyou..