According to Lewis, at What Age Does an Infant Begin

question 235

Multiple Choice

According to Lewis, at what age does an infant begin to express anger?

• A) at birth
• B) two-three months
• C) four-six months
• D) nine-twelve months
• E) two years

---

Definitions:

Nth Partial Sum

The sum of the first 'n' terms in a sequence, used in series calculations.

Geometric Sequence

A sequence in which each number following the first is generated by multiplying the former number by a fixed, nonzero factor, this factor is identified as the common ratio.

Partial Sum

The sum of a portion of a sequence of terms, or a method of summing certain numbers by grouping.

N Th

Referring to an unspecified member of a series or set.