find the sum of all odd numbers from 1 to 51 with out actual adding them
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Total odd number from=1 to 51
=28 odd number
Difference between each odd number (d) =2
Total term (n)=28
first term (a)=1
Using this formula
=n/2×(a+total number)
=28/2×(1+51)
=14×52
=628
=28 odd number
Difference between each odd number (d) =2
Total term (n)=28
first term (a)=1
Using this formula
=n/2×(a+total number)
=28/2×(1+51)
=14×52
=628
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