CMXLV is equal to ____.

Q. Find the mean of the observations $425,430,435,440,445,...........495.$

Q. The binary operation * is defined by a * b = a² + b² + ab + 1, then (2 * 3) * 2 is equal to
(a) 20
(b) 40
(c) 400
(d) 445

Q. Product of −495 and 2514 is equal to .

Q. Product of −495 and 2514 is equal to .

Q. Grace took a loan of $₹5000$. She paid $₹445$ every month for a year to repay it. How much interest did she pay?