The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) is/are followed in all the number-pairs except one. Find that odd number-pair.

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

(NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 - Operations on 13 such as adding /Subtracting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is NOT allowed)

(7, 65)

(11, 145)

Which of the following interchanges of signs would make the given equation correct?

50 - 25 ÷ 5 × 3 + 6 = 59

Select the correct combination of mathematical signs to sequentially replace the * signs and balance the given equation.

45 * 86 * 23 * 36 * 18 * 2021