The sum of all two-digit odd positive numbers.

(i) Find the sum of all two-digit odd positive numbers.
(ii) Find the sum of all 3-digit natural numbers which are divisible by 7.
(iii) Find the sum of all two-digit numbers which when divided by 7 yields 1 as the remainder.

Solution:

More Solutions:

• Find the values of a and below.
• Determine the matrices, find x.
• Find the matrix B if A [4 1 2 3] and A² = A + 2B
• Solve the matrix, compute (AB)C = (CB)A.
• Find the each of the following and state it they are equal (A + B)(A – B).
• If A = and A² = I, find x,y.