Add 5 odd number to get 20
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No, we can't make 20 by adding 5 odd numbers. (odd number is represented by 2n+1 where n = 0, 1, 2 or …) as stated before an odd number is represented by 2n+1, the sum which we got is represented in this form, so it's obviously an odd number. But 20 is an even number, so sum can't be 20.
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