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2Â months ago
The sum of two numbers is 2800 and their HCF is 7, how many pairs of such numbers are possible?
2Â months ago
80
take the numbers as 7a, 7b where a, b are co-primes; we get a+b = 400; we need to find no. of co-primes of 400 that are less than 400 and divide them by 2 for number of pairs