find the sum of all 2 dights odd positive numbers
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a = 11
an = 99
d = 2
an = a + ( n-1)d
99 = 11 + (n -1)2
88 = (n-1)2
n-1 = 44
n = 45
Sn = n/2{ 2a + (n-1) d}
= 45/2 {22 + 44*2}
= 45/2 *110
= 45* 55
= 2475
an = 99
d = 2
an = a + ( n-1)d
99 = 11 + (n -1)2
88 = (n-1)2
n-1 = 44
n = 45
Sn = n/2{ 2a + (n-1) d}
= 45/2 {22 + 44*2}
= 45/2 *110
= 45* 55
= 2475
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