?+?+?=31 only even number 2, 4, 6, 8, 10, 12, 14, 16
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even no. + even no. = even and not an odd no.
bur two odd no. can even make a even no. and also an odd no.
bur two odd no. can even make a even no. and also an odd no.
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one odd no. is necessary
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