1+3+5+7+.........+23=?
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a = 1
d = 3 - 1 = 2
tn = 23
Tn = a + (n - 1 ) d
23 = 1 + ( n - 1 ) 2
23 = 1 + 2n - 2
24 = 2n
n = 12
Since, we know that the sum of Ap formula
sm = n/2 ( a + l)
sm = 12/2 ( 1 + 24)
sm = 6 × 25
sm = 150 Answer ✔
a = 1
d = 3 - 1 = 2
tn = 23
Tn = a + (n - 1 ) d
23 = 1 + ( n - 1 ) 2
23 = 1 + 2n - 2
24 = 2n
n = 12
Since, we know that the sum of Ap formula
sm = n/2 ( a + l)
sm = 12/2 ( 1 + 24)
sm = 6 × 25
sm = 150 Answer ✔
RJRishabh:
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