Easy -1.2 This is a straightforward computation requiring evaluation of only 5 terms (r=1 to 5) with simple arithmetic: calculating 2^r(r-1) for each value and summing. No conceptual insight needed beyond understanding sigma notation, making it easier than average.
At least two terms written out, allow one error, OR correct answer. Terms may not be seen as may be done completely on calculator
\(196\)
A1
## Question 1:
| Answer | Marks | Guidance |
|--------|-------|----------|
| BC: $2\times0 + 4\times1 + 8\times2 + 16\times3 + 32\times4$ | M1 | At least two terms written out, allow one error, OR correct answer. Terms may not be seen as may be done completely on calculator |
| $196$ | A1 | |
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