Find the sum of all integers from 50 to 500 which I\'d divisible by 10

1.	Find the sum of all integers from 50 to 500 which I\'d divisible by 10
Answer» a1=50d=10an=500500 = a + (n -1)d500 = 50 + 10n - 10500 - 40 = 10n460= 10nn = 46S46 = 46/2 {2x50 + (45)10 = 23(100 + 450) = 23x550 = 12650

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