Question

Find the sum of first 25 positive integers divisible by 6

Answer 1

0+6+12+18+24+30 = 90

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Answer 2

Answer:

Step-by-step explana

positive integers :  6 12 18

a = 6     difference = 12-6   n = 25

                                 = 6

formula s(n) = (n/2) ( 2a+(n-1)*6)

                     = (25/2) ( 2*6+(25-1)*6)

                     = (12.5) ( 12+(24*6))

                     = 12.5*( 12+144)

                     = 12.5*(156)

                     = 1950