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  4. Number of five digit no. of form d1 d2 d3 d4 d5 where ds (i=1,2,3,4,5) are digits and satisfying d 1< d 2 ≤ d 3< d 4 ≤ d 5 is -

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Q. Number of five digit no. of form $d_1 d_2 d_3 d_4 d_5$ where ds $(i=1,2,3,4,5)$ are digits and satisfying $d _1< d _2 \leq d _3< d _4 \leq d _5$ is -

Permutations and Combinations

Solution:

Correct answer is (c) ${ }^{11} C _6$