Number System

151 Find the sum of the squares of first 35 natural numbers:

152 Find out the missing term in the series 12, 15, 21, 30, 42, 57, ?

153 Some birds settled on the branches of a tree. First, they sat one to a branch and there was one bird too many. Next they sat two to a branch and there was one branch too many. How many branches were there?

154 Find out the missing term in the series 3, 5, 9, 17, 33, 65, ?

155 Find out the missing term in the series 4, 25, 130, ?, 3280

156 Find the missing number in the following series. 4, 18..... 100, 180, 294

157 What should come in place of the question mark (?) in the following number series? 3, 3, 12, 108, ?, 42300

158 Find out the missing term in the series 1, 2, 6, 21, 88, 445, ?

159 Find out the missing term in the series 13, 16, 22, 33, 51, ?

160 Find out the missing term in the series 4, 8, 24, 60, ?, 224