Question

Determine how many numbers between 7 and 1610 are divisible by 6

Answer 1

b/w 7 and 1610

we get ap 12,18,24,...................1608

a=12

d=a2-a1=6

an=1608

sol:-

an=a+(n-1)d

1608=12+(n-1)6

1608=12+6n-6

1608-12+6=6n

1602=6n

1602/6=n

267=n ans