odd number = 3,9,15,21.........99
a=3
d=9-3=6
99= a + (n-1)d
99= 3 + (n-1)6
99= 3 + 6n -6
99+3=6n
102=6n
n=17
sum of the number
S17 = 17/2 (a+ last term)
S17= 17/2(3+99)
S17=17/2(102)
S17=17×51
S17=867
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Answers & Comments
odd number = 3,9,15,21.........99
a=3
d=9-3=6
99= a + (n-1)d
99= 3 + (n-1)6
99= 3 + 6n -6
99+3=6n
102=6n
n=17
sum of the number
S17 = 17/2 (a+ last term)
S17= 17/2(3+99)
S17=17/2(102)
S17=17×51
S17=867