[" What is the H.C.F of "n" and "n+1" ,"],[" where "n" is a natural number? "[J]

If the sum of the digits of a number 10^(n) - 1 , where n is a natural number, is equal to 3798, then what is the value of n ?

What is the last digit of 3^(3n)+1, where n is a natural number?

What is the sum of the coefficients of first and last terms in the expansion of (1 + x)^(2n) , where n is a natural number?

If the sum of the digits of a number (10^(n)-1) is 4707, where n is a natural number,then the value of n is :

The largest number that exactly divides each number of the form n^3 - n , where n is a natural number , is :

The set (0,2,6,12,20) in the set-builder form is (1) {x:x=n^(2)-3n+2," where "n'" is a natural number "&1 (2) {x:x=n^(2)-3n+2," where "'n'" is a natural number "&1 (3) {x:x=n^(2)-3n+4," where "'n'" is a natural number "&1 (4) {x:x=n^(2)+5n-6," where 'n' is a natural number "&1<=n<=5}