Question : Directions: In the following question observe the series and figure out the pattern used to form it. What will be the next term of the series?
1, 3, 6, 10, 15, ?

Question : Directions: In the following question a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
2, 3, 5, 6, 7, 9, 10, 11, 13, ?

Question : Directions: In the following question, a series is given, with one/two term(s) missing. Choose the correct alternative from the given ones that will complete the series.
$\frac{c}{6},\frac{e}{10},\frac{g}{14},\frac{i}{18},?$

Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
13, 14, 14, ?, 176

Question : Directions: Which number will replace the question mark (?) in the following series?
65, 62, 56, 47, 35,?