TCS Company Numerical Ability Permutation and Combination

4. What is ∑K=0283K(28KC) where 28KC
is the number of ways of choosing k items from 28 items?
a. 256
b. 3* 227
c. 329
d. 3* 427

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TCS Other Question

3. What is ∑K=028K2(28KC) where 28KC
is the number of ways of choosing k items from 28 items?
a. 406 * 227

b. 306 * 226

c. 28 * 227
d. 56 * 227
19. What is the largest number that will divide 90207, 232585 and 127986 without leaving a remainder?
a. 257
b. 905
c. 351
d. 498