Find the sum of all two digit odd positive number
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2
odd two digit is 1,3 then 1+3=4, n(n-1)
mukulji100:
Hy thats your answer
Answered by
21
11,13. ..........99 are in ap
A= 11
D= 2
Tn= 99
Tn = a+ (n-1)
99= 11 + (n-1)×2
(n-1) = 88/2
N= 45
S45 =45/2 (2×11 + (45-1)2 )
S45 = 45/2 (110)
S45 = 45×55
S45 = 2475
A= 11
D= 2
Tn= 99
Tn = a+ (n-1)
99= 11 + (n-1)×2
(n-1) = 88/2
N= 45
S45 =45/2 (2×11 + (45-1)2 )
S45 = 45/2 (110)
S45 = 45×55
S45 = 2475
Hy how the answer
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