76n- 66n, where n is an integer >0, is divisible by
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1) The rightmost non-zero digit of the number 302720 is
2) 76n- 66n, where n is an integer >0, is divisible by
3) Consider four digit numbers for which the first two digits are equal and the last two digits are also equal. How many such numbers are perfect squares?
4) Find the remainder when 6799 is divided by 7.
5) Find the least number which will leaves remainder 5 when divided by 8, 12, 16 and 20.