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40 questions

GRE

The common difference of an AP in which a25 − a12 = −52 ...

The common difference of an AP in which a25 − a12 = −52 is (a) 4 (b) −4 (c) −3 (d) 3

If 6/5 , a, 4 are in AP, the value of a is

If 6/5 , a, 4 are in AP, the value of a is (a) 1 (b) 13 (c) 13/5 (d) 26/5

The 16th term of the AP : 15, 25/2 ,10, 15/2 , is

The 16th term of the AP  : 15, 25/2 ,10, 15/2 , is (a) 45/2 (b) − 45/2 (c) 105/2 (d) -105/2

If an AP a = −2.5, d = 0.5, an = 7.5 then n is

If an AP a = −2.5, d = 0.5, an = 7.5 then n is (a) 20 (b) 21 (c) 3.6 (d) −3.6

The sum of first 50 odd natural numbers is

The sum of first 50 odd natural numbers is (a) 2500 (b) 2400 (c) 2600 (d) 2300

Two APs have the same common difference. The first term of o...

Two APs have the same common difference. The first term of one of these −1 and that of the other is −8. Then the difference between their 4th ter...

If in an AP a = 1, tn = 20 and Sn = 399 then n is

If in an AP a = 1, tn = 20 and Sn = 399 then n is (a) 19 (b) 21 (c) 38 (d) 42

The 9th term of an AP is 499 and 499th term is 9. The term w...

The 9th term of an AP is 499 and 499th term is 9. The term which is equal to zero is (a) t508 (b) t805 (c) t504 (d) ...

The sum of first 18 terms of an AP whose nth term is 3 − 2...