Which number will replace the question mark (?) in the following series?
60, 64, 32, 36, 18, ?
It is an alternative series of (60,32,18) and (64,36,22).
$$60-32=2\times\ 14.$$
$$32-18=14.$$
Similarly,Â
$$64-36=2\times\ 14.$$
$$36-22=14.$$
D is correct choice.
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