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Computer Science · 2026 · 1 mark
CBSE 2026 · Central · Set 4 · Q20
Assertion (A): [1,2,3]+'123' is an invalid expression in Python. Reason (R): In Python, a list cannot be concatenated with a string.
Assertion (A) : [$\displaystyle 1,2,3$]+'$\displaystyle 123$' is an invalid expression in Python.
Reason (R) : In Python, a list cannot be concatenated with a string.
Official answer
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation for Assertion (A).
Marking-scheme solution
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the
correct explanation for Assertion (A).
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CBSE Class 12 Computer Science past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.