Find the number of zeros at the end in product `5^6 .6^7 .7^8 .8^9 .9^(10) .30^(31)` .

Find the exact number of real zeros and imaginary of the polynomial x^9 + 9x^7 + 7x^5 + 5x^3 + 3x .

Find the number of n digit numbers, which contain the digits 2 and 7, but not the digits 0, 1, 8, 9.

Find the number of three-digit numbers formed by using digits 1,2,3,4,6,7,8,9 without repetition such that sum of digits of the numbers formed is even.

Find the mode of the following data. 5,6,9,10,6,12,3,6,11,10,4,6,7

Find the mean deviation about the median for the data in {:("x"_(i),5,7,9,10,12,15),("f"_(i),8,6,2,2,2,6):}

Find the product of: (-9) xx (-8) xx (-7) xx (-6)

The following numbers are the sizes of shoes sold by a shop in a particular day. Find the mode. 6, 7, 8, 9, 10, 6, 7, 10, 7, 6, 7, 9, 7, 6