Question
Two circles of radii 15 cm and 10 cm touch each other
externally at a point A. PQ is the direct common tangent of those two circles of centers O ₁ and O ₂ respectively. The length of PQ is equal toSolution

What will be the next number in the series?
2, 7, 23, 70, ?
56. 23 45 89 177 363 705
...5 29 ? 569 1703 3401
...120 119 ? 352 2464 2455
...Select the number from among the given options that can replace the question mark (?) in the following series.
2, 6, 12, 20, ?, ?
97 106 121 138 157 180
...2, 12, 36, 80, ?, 252
102 153 306 765 ? 8032.5
...D irection: Which of the following will replace ‘?’ in the following series
300, 300, 301, 303, ‘?’, 324, 364
...261 256 246 231 211 ?
...