Find the sum of the 1st 40 positive integers divisible by six?
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the smallest positive integer divisible by 6 is 6
the greatest positive integer divisible by 6 is 36
A.P: 6,12........36
a=6, d=6 & an=36
an= a+(n-1)d
36=6+(n-1)6
36-6=(n-1)6
30/6=n-1
n=5+1
n=6
S6=n/2(a+an)
S6=6/2(6+36)
S6=3×42
S6=126
the greatest positive integer divisible by 6 is 36
A.P: 6,12........36
a=6, d=6 & an=36
an= a+(n-1)d
36=6+(n-1)6
36-6=(n-1)6
30/6=n-1
n=5+1
n=6
S6=n/2(a+an)
S6=6/2(6+36)
S6=3×42
S6=126
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