This question was asked in Ex 8.3, 1 (a)
Product of consecutive even (OR) odd natural numbers is given as in the example 
11 x 13 = 143 = (12) ² - 1 
Similarly = 13 x 15 = (14) ² -1 = 195 
Now complete the given statement  = 29 x 31 =? 
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