4. Calculate the increment in product

The product of 28 \(\times\) 34 is 952.
 
(i) In the product \(a \times b\), if the first number \(a\)  increased by \(1\), then express the increase in product in terms of \(a\) and \(b\).
 
i+ii=i+i
 
(ii) The numerical increase in product is .
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