If each term in the sum a1 + a2 + a3 + ... +an is either 7 or 77 and the sum is equal to 350, which of the follow
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If each term in the sum a1 + a2 + a3... + an is either 7 or.
Far easier : As 7x+77y=350, and as the last digit of both numbers is 7, the only way to multiply 7 (or 77) to get a multiple of 10 (350) is to multiply them by 10.
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