10th Standard Math’s Chapter 7

Q.60 The 21st term of the AP whose first two terms are –3 and 4 is

Q.61 If the 2nd term of an AP is 13 and the 5th term is 25, what is its 7th term?

Q.62 If the common difference of an AP is 5, then what is a₁₈ – a₁₃?

Q.63 The sum of first 16 terms of the AP: 10, 6, 2,... is

Q.64 The sum of first five multiples of 3 is

Q.65 The middle most term (s) of the AP:–11, –7, –3, ..., 49 is:

Q.66 Two APs have the same common difference. The first term of one of these is –1 and that of the other is – 8. Then the difference between their 4th terms is

Q.67 If 7 times the 7th term of an AP is equal to 11 times its 11th term, then its 18th term will be

Q.68 In an AP if a = 1, a_n = 20 and S_n = 399, then n is

Q.69 If the numbers n – 2, 4n – 1 and 5n +2 are in AP, then the value of n is:

Q.70

O is the point of intersection of two equal chords ABand CD such that OB = OD, then triangles OAC and ODB are