i) find the formula for the sum s of any four consecutive numbers.
ii) find the number if the sum is 42.
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Step-by-step explanation:
i) 4n+6
n+n+1+n+2+n+3=4n+6
ii) 4n+6=42
4n=36
n=36/4=9
the numbers are 9,10,11,12
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