What is the sum of fitst 20 odd natural number.
Answers
Answered by
0
1+3+5.......an
An = a+(n-1)d
=1+(20-1)2
=39
Sn=20÷2[(2×1)+(20-1)×2]
=10[2+38]
=400
An = a+(n-1)d
=1+(20-1)2
=39
Sn=20÷2[(2×1)+(20-1)×2]
=10[2+38]
=400
Similar questions