105
First multiply 1 and 3 to get 3. Second multiply 3 and 5 to get 15. Third multiply 15 and 7 to get 105.
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No such numbers exist; the product of two odd numbers is always odd.
The sum of any four odd numbers will never be equal to an odd number.
The sum or product of three odd numbers will always be odd.
9801 * The sum of the first two odd numbers (1+3) is 4, or 22 * The sum of the first three odd numbers (1+3+5) is 9, or 32 * The sum of the first four odd numbers (1+3+5+7) is 16, or 42 * ...and so on So the sum of the first 99 odd numbers, using the pattern above, would be 992 or 9801.
The only way to get an odd product when multiplying two whole numbers is when both of them are odd. Thus, in your example, the only way is by choosing the odd numbers 7 and 5, whose product is 35.