Which number will replace the question mark (?) in the following series?
28, 32, 48, 84, ?
$$28+2^2\ =\ 28+4\ =\ 32$$
$$32+4^2\ =\ 32+16\ =\ 48$$
$$48+6^2\ =\ 48+36\ =\ 84$$
$$84+8^2\ =\ 84+64\ =\ 148$$
Here 148 will come in place of the question mark.
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