CAT Quant Practice Problems

Question: What is the number of distinct terms in the expansion of \((a+b+c)^{20}\)?
  1. 231
  2. 253
  3. 242
  4. 210
  5. 228

Correct Option:1

The power is 20.

20 has to be divided among a, b and c. This can be done in $^{20+3-1}C_{3-1}$ = $^{22}C_2$ = 231


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