how many number in between 200 to 600 divisible by 7 . please replay the solution briefly
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203,...,595
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happy new year in advance
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chiranjibi1:
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first number divisible by 7 between 200 and 600=203
last number divisible by 7 between 200 and 600=595
it forms an AP
a=203 d=7 l=595
l=a+(n-1)d
595=203+(n-1)7
392=7n-7
399=7n
399/7=n
57=n
numbers are 57
last number divisible by 7 between 200 and 600=595
it forms an AP
a=203 d=7 l=595
l=a+(n-1)d
595=203+(n-1)7
392=7n-7
399=7n
399/7=n
57=n
numbers are 57
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