Find the sum of first 17 odd natural numbers ?
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1, 3, 5, 7, 9, . . . . , 33.
The first term a = 1
The common difference d = 2
Total number of terms n = 17
Sum = n/2 x (a + Tn)
= 17/2 x (1 + 33)
= (17 x 34)/ 2
= 578/2
1 + 3 + 5 + 7 + 9 + . . . . + 33 = 289
The first term a = 1
The common difference d = 2
Total number of terms n = 17
Sum = n/2 x (a + Tn)
= 17/2 x (1 + 33)
= (17 x 34)/ 2
= 578/2
1 + 3 + 5 + 7 + 9 + . . . . + 33 = 289
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