Express the following as the sum of two consecutive integers.
(i) 21^2
(ii) 13^2
(iii) 11^2
(iv) 19^2
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(i)21^2=441
=220+221
(ii)13^2=169
=84+85
(iii)11^2=121
=60+61
(iv)19^2=361
=180+181
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