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(b) In case an adverb describes the 'to be' verb form (is, am, are, was, were), it is placed after the verb. So, here the adverb 'often' should come after the plural verb 'are' ('to be' form of verb). Options a) and b) make this correction, but option a) is incorrect because 'like' is a base form of verb, whereas 'are' should be followed by the participle form of verb (either past participle (V3) or present participle (V4, i.e., -ing from)). So, option b) correctly replaces the highlighted phrase. Hence, option b) is correct.
15, 120, 840, 5040, ?, 100800
11 22.5 47 102 236 ?
...What will come in place of the question mark (?) in the following series?
2.5, 6.5, 18.5, 54.5, 162.5, 486.5, ?
140, 146, 158, 176, ?, 230
17 18 14 ? 7 32
...10, 10, 30, 150, ?, 9450
17, 19, 41, 127, 513, ?
116, 118, 124, 136, 156, ?
-1, 5, 23, 59, ?
84, 97, ?, 162, 214, 279