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Lesson 1: Counting Principle, Permutations (nPr) and Combinations (nCr) — Picture questions (exam style)

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1.
In (1 + x)n the ratio of the coefficients of T_4 and T_3 is 3. Which option is correct?
In (1 + x)ⁿ the ratio of the coefficients of T_4 and T_3 is 3. Which option is correct?
n = 11, number of terms = 13
n = 11, number of terms = 11
n = 5, number of terms = 12
n = 11, number of terms = 12