Question

find the sum of all odd number from 1 to 150 ​

Answer 1

Answer:

first make an A.P

1,3,5,7..........................149.

here,a = 1

d = 2

an = 149

put in formula,

an = a + (n-1)d

149 = 1 + (n-1) 2

(149 - 1) ÷ 2 = n-1

148 ÷ 2 = n-1

74 + 1 = n

n = 75

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