Looking at a photograph of a woman, Samuel said, "She is the mother of the daughter of my father's brother." How is Samuel related to the woman in the picture?

Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the one that is different.

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

45 * 86 * 23 * 36 * 18 * 2021

Which of the following numbers will replace the question mark (?) in the given series?

2, 10, 40, 120, 240, ?