Question

The sum of first 45 positive integers divisible by 4 is ​

Answer 1

Answer:

4,8,16------- a = 4

d = 4

n =45

s45 = 45/2 (8+(45-1)4)

45/2(8+44×4)

45/2(8+176)

45/2×184

45×92

4140