205) What is the value of 1^2 – 2^2 + 3^2 – 4^2 + … + 99^2 – 100^2?

201) If a, b, c and d are positive integers such that a^b×c^d = 2^10 × 7^9, what is the least possible value of a + b + c + d ?

205. 50*(-2) = -100.

,.....................................

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up