Question

(2) Find the sum of all even numbers between 1 and 150.
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Answer 1

Step-by-step explanation:

including 150 it is 22500

including even number upto 148 it is 442

Answer 2

a=2

l=148 (last term)

a+(n-1)d = 148

2+(n-1)2 = 148

n-1 = 73 -----> n=74

d=2

Sum = n(a+l)/2

= 74(2+148)/2 = 74×150/2 = 75×74 = 5550

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