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© MULTIPLE-CHOICE QUESTIONS, , 1, The 20th term of the sequence defined by a, = (n - 1)(2 - n) (3 +7) is:, , , , (a) — 7866 (b) 7866 (c) 6678 (a) —6678., 2, The 5th term of an A.P. is 10 and 10th term is zero, then its 20th term is:, (a) 20 (b) 10 (c) —20 (d) -10., g. The number of terms in the sequence 3, 7, 11, ......, 407 is:, (a) 100 (b) 102 (c) 101 (d) 105., 4, Ifa,=-2n+5in an A.P. then the common difference is :, (a) -2 : (b) 2 (co) 5 (d) -5., 5. IfK+2,4K-6, 3K -2 are the three consecutive terms of A.P. then the value of, Kis: (a) 1 : (b) 2 (c) -1— (dd) 3, 6. Thesum of first 30 natural numbers is :[HB 2016], (a) 465 (b) 900 (c) 930 (d) None of these., 7. The sides of a right angled triangle are in A.P. then they are in ratio:, (a) 2:3:4 (b) 3:6:7 (c) 3:4:5 (d) None of these., 8. The sum of odd integers from 1 to 2001 is: ., (a) 1002001 (b) 1000201 (c) 20101 (d) None of these., 9. Ifsum ofr terms of an AP. is n? + 2n then the common difference is, (a) 1 (b) 2 @ =1 (d) -2., 10. The sum of first 100 even natural numbers which are divisible by 5 is, (a) 500 (b) 5050 (c) 50500 (d) none of these., 11. A.M. of 10 and 20 is:, (4) 10 (b) 20 (c) 12 (d) 15, 12. G.M. of 8 and 18 is: [HB 2016], (a) 18 (b) 26 () 10 (d) 12, 18.. There are 6 A.M.’s between 3 and 24, the common difference of A.P. is:, (a) 2 (b) 3 (c) 4 (d) 5, 14, The sum of n A.M.’s between a and 6 is:, (a) n(a +b) (b) na+b (c) (2 ; a ) (d) none of these, 15. The value of x, the numbers 3, xy -t are in G.P., is:, (a) +1 (b) +2 () #3 (d) +5., 16. The 6th term of the sequence 1, + i, -4, cen S, 1 1 1 Hy, (a) G4 (b) 39 © 39 @ -¢z:, 8th term of G.P. is 192 and common ratio is 2 then the 12th term is:, 1) 8072 (b) 372 (c) 3372 (d) none of these., ith term of a G.P. is square of its 2nd term, and the-first term is - 3. Then its, term is, , 218 (b) 287 (c) 2187 (d) — 2187,