Maths Permutations & Combination Problem Based on Distinct and Identical Objects and Divisors Subjective Type
Published on: August 14, 2026

Find number of ways of selection of one or more letters from AAAABBCCCDEF

(i) there is no restriction.

(ii) the letters A & B are selected atleast once.

(iii) only one letter is selected.

(iv) atleast two letters are selected

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(i) AAAABBCCCDEF

A → 4

B → 2

C → 3 (4 + 1) (2 + 1) (3 + 1) (1 + 1) (1 + 1) (1 + 1) – 1 = 5 . 3 . 4 . 2 . 2 . 2 – 1 = 480 – 1 = 479

D → 1

E → 1

F → 1

(ii) A → 3

B → 1

C → 3 (3 + 1) (1 + 1) (3 + 1) (1 + 1) (1 + 1) (1 + 1) = 16 × 16 = 256

D → 1

E → 1

F → 1

(iii) Only one letter selected 6 C 1 = 6

(iv) Atleast two letters selected =Total–(no letter is selected)–(One letter selected) = 480–1– 6= 473

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