7. In a Science department, 120 students took Methematics, 100 took Physics and 75 took Biology. Also, !'0) took both Mathematics and Physics, QU took both Mathematics and Biology, 45 took both Biology and Physics and 35 took ell three subjects. The number of students, who took only Mathematics from these three subjects, is 40 0 35 O 120 0 5 8. If sum of Interms of an A. R. starting with 2. is ne + 1. then the rich term is On+1 O 2n O 2(2n - 1) Oh- 1 9. If the first term of an infinite geometric series is equal to twice the sum of all the terms that follow the term, then the common retio is: O 1/3 O1 O 1/2 02 10. If the complex: number 2 is such the: |2| = 1. them on the complex plane 22/2 lieson A circle Astraight line (O Any one of two straight lines