How many is the sum of multiplication of 7 plus 2 divided by 5 and the remainder

How many is the sum of multiplication of 7 plus 2 divided by 5 and the remainder

77 * 7 = 497 * 7 * 7 = 3437 * 7 * 7 * 7 = 24017 * 7 * 7 * 7 * 7 * 7 = 168077 * 7 * 7 * 7 * 7 * 7 = 1176497 * 7 * 7 * 7 * 7 * 7 = 8235437 * 7 * 7 * 7 * 7 * 7 * 7 * 7 = 5764801. It can be seen that the mantissa of N-7 multiplication is regular. Repeat every 4 times. 97 / 4 = 24 odd 1, so the product number of 97 7 is 7 plus 2, mantissa is 9