how many numbers up to 500 which is divisible by 3& 7 together?
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usin Ap
21,42...483
Tn=a+(n-1)d
483=21+(n-1)21
(483-21 )÷21=n-1
462÷21=n-1
22=n-1
22+1=n
23=n
so 23 no. can be divisible by 2&7 together upto 500
21,42...483
Tn=a+(n-1)d
483=21+(n-1)21
(483-21 )÷21=n-1
462÷21=n-1
22=n-1
22+1=n
23=n
so 23 no. can be divisible by 2&7 together upto 500
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