Find the sum of all odd number from 1 to 150.
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hi..
A.P. = 1 + 3 + 5 + ...................+ 149
here,
a = 1
d = 2
l = 149
first we will find,
a(n) = 149
a + (n-1)d = 149
1 + (n-1) 2 = 149
n-1 = 148/2
n = 74 + 1 = 75
so,
n = 75
sum of n terms = n/2 [2a + (n-1)d]





A.P. = 1 + 3 + 5 + ...................+ 149
here,
a = 1
d = 2
l = 149
first we will find,
a(n) = 149
a + (n-1)d = 149
1 + (n-1) 2 = 149
n-1 = 148/2
n = 74 + 1 = 75
so,
n = 75
sum of n terms = n/2 [2a + (n-1)d]
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